OzVMX Forum
Marque Remarks => Yamaha => Topic started by: firko on November 21, 2009, 12:11:06 pm
-
Heres a nice simple revamp of a 360 MX. While I like the blokes individual take on the bike, I've got to question the swingarm. It's probably legal by their rules but definitely ilegal by ours. Despite there being no historic precedent for those arms, Aussies keep buying them because they "look cool". The sooner the swingarm section of the rulebook is tightened up the better. The head National scrutineer agrees with my take on them so check before you spend your money on something you may not be allowed to use in open competition.
1973 Yamaha 360 MX
This bike was given to customer Shawn McDonald, the Publisher of "Bench Racer" magazine, by the "First American" Jim Pomeroy. Jim never actually raced the bike, but wanted it to go to some old racing friends from back in the day, so that they could enter the world of vintage MX racing. The first racer was childhood friend, Yakima, Washington neighbor, and toughest opponent Rick Poulin. It didn’t even last one moto as the pipe fell off at the cylinder at the Dinosaur Daze race. It did get Rick started in the world of vintage racing though.
It was determined at that point that Full Circle Racing would take over a complete restoration of the bike to a better than NEW condition. Sitting down with the customer it was determined and agreed upon that why restore a historically ugly bike to N.O.S. condition especially since the restored value would not be anywhere near the restoration costs. Let’s give it it's own look that would not easily be identified by a non vintage motorcyclist. Let’s hot rod the bike for looks and performance.
After dismantling the bike and tagging each part it was determined what, when and for how much each part would need to be modified, replaced or restored. The original frame while useable for racing had smashed frame tubes under the engine attesting to a previous life as a trail bike. An alternative Yamaha SC 500 frame was found which then was media blasted and powder coated black. The steering head ball bearings were replaced with "ALL BALL’s" tapered roller bearings. The Yamaha’s were notorious for their twisty, twitchy handling under power. Back in the day legendary desert racer Al Baker fixed the problem by selling a 1 ½ inch extension kit for swing arm length behind the shock position. This provided stability under power. It also unfortunately lengthened the wheelbase which was great for desert, but would make it harder to steer in slower motocross corners. Working with Novation Racing (novationracing.com) in Spokane, Washington, a prototype box aluminum swing arm was constructed with an additional 1" of length which is now part of their catalog. To handle the rear suspension a Works Performance dual rate gas shock was used with a 14 inch eyelet to eyelet length. The extra one inch of swingarm length, along with the longer shock, raised the rear end thus quickening the steering. The extra 1" of swingarm length helps put maximum horsepower to the ground and reduce useless wheelies. The stock ridged Japanese rims were replaced by brushed aluminum Sun rims with Buchanan’s stainless steel spokes and trued by Full Circle. The brakes were cleaned and replaced. The front forks were spaghetti and were replaced with straight newer tubes. Fork springs were replaced with Progressive springs. Fenders are white Vintage Iron replicas. Cables and levers and perches were replaced with N.O.S. The throttle is a Gunnar Gasser and handlebars are aluminum Malcolm Smith models. A very hard to find N.O.S. carburetor-airbox boot was found. The cylinder, head and carburetor were media blasted from black to silver in an effort to brighten up a previously dark bike. The tank is from a 1976 YZ 125 and was found with no dents. The tank mounts on the front and rear of the frame were relocated to accept the new tank. The tank was brought to Mitch McAllister where it was prepped, painted and masked for a classic 1950's custom car flame job with five different different pearl coats to sparkle in the sun. A custom aluminum red anodized gas cap was made by Novation Racing. Mitch also painted the side panels white to match the fenders/tank. Because the seat provided for much of the suspension back in the 1970's the seat was custom made using the highest density foam available. It was raised 1 ½ inches in the front and tapering down to 3/4 inch raise at the rear with a custom made seat cover for a one off factory look. The stock expansion chamber was replaced by a Circle "F" pipe. Because the riders complained that the pipe stuck out to far and burned their legs the pipe was cut and re welded for proper clearance. The pipe was then ceramic coated, keeping heat inside the chamber and keeping it cooler outside. The silencer was replaced by an aluminum oval FMF silencer cut to length. The engine was taken apart to remove the counter balancer and a PVL ignition replaced the faulty stock ignition. An 8 oz weight for more flywheel effect at lower RPM’s was also added. A new bore job and top end were installed and the gearbox was freshened up. What also was found were some built in finger ports and exotic porting in general. Bolts were replaced with grade 8 or SS bolts and clear gas tubes were used for all exterior tubing. Michelin MX tires, tubes, gold DID chain and new sprockets finish off the bike.
The bike was first put into the hands of ex factory Honda star of the early 80's Phil Larson jr where he won the highly competitive 40+ Expert class in multiple races. The biggest prize was at the 2004 Vintage Iron World Championships by winning the 40+ Expert in the vintage class and then the next day winning in the two-stroke class. Then it was handed to 1970's racer Doug Raines who bumped up to the 50+ Expert class where he won every where he showed up at. Next up was Mark Kaestner, another top 1970's racer, who went undefeated in the 50+ Expert class. Out of 28 starts, 26 of them were hole shots. Phil commented that the bike in a straight line had as much horsepower as his factory Honda’s in the early 80's. Everywhere the bike goes it gathers crowds either at the racetrack or on show at a dealer. Mostly they say "What is that?"
(http://img.villagephotos.com/p/2005-8/1062154/MX360%203.jpg)
(http://img.villagephotos.com/p/2005-8/1062154/MX360%201.jpg)
(http://img.villagephotos.com/p/2005-8/1062154/MX%20360%204.jpg)
(http://img.villagephotos.com/p/2005-8/1062154/MX%20360%205.jpg)
-
Heres a nice simple revamp of a 360 MX. While I like the blokes individual take on the bike, I've got to question the swingarm. It's probably legal by their rules but definitely ilegal by our rules. Despite there being no historiv precedent for those arms, Aussies keep buying them because they "look cool". The sooner the swingarm section of the rulebook is tightened up the better. The head National scrutineer agrees with my take on them so check before you spend your money on something you may not be allowed to use in open competition.
Yep I agree you have to really work to look cool when you are Australian ;D
Novation = bad Period PDI = Good
(http://i245.photobucket.com/albums/gg71/marcFX_photo/IMG_3308.jpg)
-
Jeez Marc, that's the plug ugliest swingarm I've seen. It's not the swingarm itself but the weird gusseting and shock mount. I've got two of those Boyd and Stellings/PDI swingarms and no offence, neither is as fugly as yours ;D. Deft use of a grinder will get them back to being things of beauty (and most importantly of all, period integrity).
I realise the sarcasm in your good/bad comparison but my point is historical accuracy not beauty is the key to pre 75 bikes remaining relevent. If non period parts are allowed we'd end up with all sorts of later model parts being used on early bikes. There are plenty of period swingarms available for the MX frame...Thor, B&S/PDI, Pro-Fab, Pro-Tec,Champion, C&J and more that could be replicated. The Novation swingarm is a modern style of construction that myself and many others reckon looks wrong evin if it was legal (which it ain't)
Below are my my period Maico B&S swingarm (above) and the full B&S complete with similar alloy arm.
(http://img.villagephotos.com/p/2005-8/1062154/bsswing.jpg)
(http://img.villagephotos.com/p/2005-8/1062154/cd6%20044.jpg)
-
100% agree the Novation swingarms on some bikes are nothing like the real deal and look wrong. OK on Maico or 250RZ, wrong on pre 75.
BTW as you know I have a soft spot for ugly swingarms and the shock mounts on the Yam have grown on me plus they allow you to adjust the shock position for between 2" and 10" of wheel clearnance.
(http://i245.photobucket.com/albums/gg71/marcFX_photo/MarcsFrame054.jpg)
-
Firko that is the nicest looking tm400 I have seen for a while thanks, Michael.
-
Mark. that swingarm is waaaayyy fuggen ugly, makes a otherwise nice looking bike look a peice of crap (no ofence but I think you'll strugle to find a human that agrees with you). The shocks are too long as well making it look like a weird EVO bike. One of the things I enjoy about VMX is some bikes are gorgeous even in their original state and even if they weren't a race winning package eg; 74TM's might not have been close to an RH, RN but I think they looked pretty good, MXA Yamahas might have been a world away from a YZA but I think they looked better with their bumble bee color scheme, but I guess beauty is in the eye of the beholder. I think your MX/YZ hybrid would look way better with a std swingarm and the correct length shocks. Cheers John.
-
I need shocks ;) but I do like the look of the swingarm so if it works for you Marc stick with it I reckon it will look good thanks Michael. :)
-
Weather they are deemed ugly or not the above swingarms are good examples of the first attempts at long travel suspension conversions by the aftermarket producers of the day.
-
Mark. that swingarm is waaaayyy fuggen ugly, makes a otherwise nice looking bike look a peice of crap (no ofence but I think you'll strugle to find a human that agrees with you). Cheers John.
woh hay the one on the RM is far uglier. ;D The beauty of the MX swingarm is you can slip the shocks back a hole and ride pre 74 in the morning and move them forward for Ultimate Evo in the afternoon.
-
Jeez Marc, that's the plug ugliest swingarm I've seen. It's not the swingarm itself but the weird gusseting and shock mount.
Hey Mark I actually have two of them, the other is going on B44 frame with full Rickman body work ;D
-
That's a coincidence Marc, mine's coming out of the Maico and is going into my Rickman Maico project.
-
sorry yamy arm is butt ugly.but then variety makes our sport/hobby what it is
-
sorry yamy arm is butt ugly.but then variety makes our sport/hobby what it is
Beauty is in the eye of the beholder my friend......
We were discussing building bikes from bits, my bikes seem to always start with one key part, like a swingarm.
-
An interesting post and bike Firko - a good read. Either the mods or the riders have transformed the bike. Here is a contemporary test. Pretty accurate as I remember it (for a MX250). Chattering, bottoming, front end; dancing rear end; heavy. But faithfully and reliable 8).
http://vintagemx.com.au/?p=325#more-325
-
Mark. that swingarm is waaaayyy fuggen ugly, makes a otherwise nice looking bike look a peice of crap (no ofence but I think you'll strugle to find a human that agrees with you). The shocks are too long as well making it look like a weird EVO bike. One of the things I enjoy about VMX is some bikes are gorgeous even in their original state and even if they weren't a race winning package eg; 74TM's might not have been close to an RH, RN but I think they looked pretty good, MXA Yamahas might have been a world away from a YZA but I think they looked better with their bumble bee color scheme, but I guess beauty is in the eye of the beholder. I think your MX/YZ hybrid would look way better with a std swingarm and the correct length shocks. Cheers John.
And losing that cravass between the tank and seat marc would help....
# So how does that fit into pre 75 if you make a swing arm or use one of them bs ones etc and the shock mounts are obviously in a position differant to standard as per the rules ? how does that work ? or can i take a standard MX swing arm and add Another 1 " after the shock mount as done in the day and still be legal ? the swing arm Rules are very Grey i think .
# the bike at the top while being a tidy unit, really hasnt had a lot done to it, visually it still looks like a plain jane MX with a small tank and a differant arm, for what they probally spent on it id like to see somthing a bit better visually than that in the garage......
-
So how does that fit into pre 75 if you make a swing arm or use one of them bs ones etc and the shock mounts are obviously in a position differant to standard as per the rules ? how does that work ? or can i take a standard MX swing arm and add Another 1 " after the shock mount as done in the day and still be legal ? the swing arm Rules are very Grey i think .
There's nothing obscure about the rules. As long as you use the standard top and bottom shock mounts and maintain the same geometry all is well. Any swingarm lengthening should be behind the shock mount to maintain the same shock/swingarm/frame triangulation. One side issue that does arise from lengthening the swingarm behind the shock mount is that it slightly increases the rear suspension travel so it pays to keep an eye on that department.
-
And losing that cravass between the tank and seat marc would help....
# So how does that fit into pre 75 if you make a swing arm or use one of them bs ones etc
# the bike at the top while being a tidy unit, really hasnt had a lot done to it, visually it still looks like a plain jane MX with a small tank and a differant arm, for what they probally spent on it id like to see somthing a bit better visually than that in the garage......
How does a FOX swingarm fit into the era being 2" longer, or should we just keep everything stock like in the old days ???
I mean MX has a history which included a few hop up parts, building a better mousetrap was part of the deal. The rules allow for that.
The cravass between the tank and seat is due to lack of automotive upholsterers in Shibuya. Much harder to build these bikes in Japan, you just use what you can find.
-
Novation = bad Period PDI = Good
(http://i245.photobucket.com/albums/gg71/marcFX_photo/IMG_3308.jpg)
[/quote]
Mark with a little work you could make that look really nice ;) lose the kids shop project swinging arm and the undersize tank , fit some shorter shocks and you could build this ;D Im not sure but i think the Japs even managed to build it in Japan :o Oh the cow catcher underneath would have to go to
(http://i40.photobucket.com/albums/e204/tmbill/1973-Yamaha-MX-250-Silver-1988-1.jpg)
-
Each to there own Bill, my MX250 has the original tank and I could leave it stink bug stock with ass on the ground rear shocks and trail bike tank, but thought it was boring as regular pussy ;).
Too much DT for me, then I thought, what if I use the period accessories of the day including the magnificent works PDI swingarm and rare NOS cow catcher, then chucked in a small YZ tank like on the TMGP..... looking less like 'oh no' and more like OW.
-
Each to there own Bill, my MX250 has the original tank and I could leave it stink bug stock with ass on the ground rear shocks and trail bike tank, but thought it was boring as regular pussy ;).
Too much DT for me, then I thought, what if I use the period accessories of the day including the magnificent works PDI swingarm and rare NOS cow catcher, then chucked in a small YZ tank like on the TMGP..... looking less like 'oh no' and more like OW.
I havent seen an "OW" looking like an "OH NO" before, ......until now.
At least try to get the little YZ125A tank to sit properly and as for the ass on the ground I believe its a better look than a swingarm thats has 5mm angle iron spot welded to it.
I do hear love is blind though.
-
I believe its a better look than a swingarm thats has 5mm angle iron spot welded to it.
I do hear love is blind though.
[/quote]
Yep I love that swingarm 8), that longditudinal adjustment means I can get her down in the weeds like an MX250 if I feel like low riding.
-
Marc, OW and your bike are words and images that should not be mixed together!!!!!!!, and as for calling your swing arm "works"...... you need to wash your mouth out with some saki or are you already on the grog and it's effecting your judgement?......severely. You better hope that Mr Yamaha's henchmen dont turn up on your doorstep and kick the shit out of you for blasfurming one of their products!!!. I think you should be limited to Yamaha piano's or drumsets, just stay away from the bikes. ;)
-
I think you should be limited to Yamaha piano's or drumsets, just stay away from the bikes. ;)
I think this is the bike that Yamaha really wanted to build, but PDI had already developed the swingarm so Yamaha were stuck with mediocre handling made even worse when the monoshock came along.
BTW Bill those shocks look like they were ripped off a Mudbug.
-
How long's the wheelbase Marc? Must be near 59"
-
Yeah its about an inch longer than stock, there are longer arms available in Japan but I think that is over compensating. ;D
(http://i245.photobucket.com/albums/gg71/marcFX_photo/toukun007-img600x450-1218983449lkb4.jpg)
-
I reckon you blokes are a bit tough on Marc and his MX250. While I don't particularly like the YZ125 tank on the MX..it looks a tad too short to my eye I love the fact that he's doing something different and not following the cookie cutter mentality that many seem to follow. As far as the swingarm goes, all it needs is a bit of grinding to remove those fluck ugly gussets and a bit of a sandblast and you'll have a thing of beauty like the one on my Maico (below). Those old Boyd and Stellings/PDI swingarms have a real place in MX history as the first commercially available alloy swingarm having been around since 1969 (documented to quieten a certain WA serial whinger). The period Works shocks are an inch or so too long I reckon, which will really fluck with the straight line stability. Those Works shocks can easily be shortened or if you get desperate I can swap you for shorter 13" versions. I did a similar job on a TM250, turning one of MXs blandest bikes into something a bit interesting, just as you're doing.
Compare my beautiful swingarm to the fugly one on Marcs MX. Hard to believe that they're the same thing.
(http://img.villagephotos.com/p/2005-8/1062154/camden101.jpg)
Boyd and Stellings brochure dated July 1969
(http://img.villagephotos.com/p/2005-8/1062154/bs%20sw.jpg)
-
(http://img.villagephotos.com/p/2005-8/1062154/camden101.jpg)
(http://i323.photobucket.com/albums/nn458/mx250syd/icons/sick.gif)(Black rims)
-
thanks for the kind works Firko, the beauty of one of these swingarms is like a good vintage wine and an acquired taste.
BTW if I took the grinder to my swingarm then i wouldn't have the trick 3 position adjustability. Just for a hoot I must take a picture of it in the closest hole to the pivot.
(http://i245.photobucket.com/albums/gg71/marcFX_photo/MarcsFrame054.jpg)
-
what is the swing arm in the last pic
-
what is the swing arm in the last pic
It is PDI RM125, very rare and asthetically pleasing.
-
Yeah its about an inch longer than stock,
Looks more like 3" longer Marc
-
i would have to agree with you there ;D
-
Well we all wish it was 3" longer sometimes. ;D
-
(Black rims)
Yup, black rims, cool eh Graeme?
I must plead guilty to the black rim bigots. I did them back in 1993/4 and I think I was the first go black on a pre 75 bike to my knowledge. It was way cool back then but has had it's day in 2010.
Don't worry though, because I've had a tap on the shoulder from the pit Nazis telling me my hubs are 'verboeten' so it's going back to the original shiny Akronts and full width front hub if I decide to bring the old puppy back onto the track.
Ijn reflection though, the black rims aren't as bad as the earlier purple rim or fluro phases I went through. Everyone hated them. which achieved the desired effect. ;)
Sigh!It's so hard being a fashion icon. 8)
(http://img.villagephotos.com/p/2005-8/1062154/santa1b.jpg)
Santa, blender, 350 squarie and '73 250
(http://img.villagephotos.com/p/2005-8/1062154/pink%20and%20orange.jpeg)
Fluro orange '73 250 and fluro pink '73 440. Tastful and understated circa '92
-
I'll take a copy of your B&S though(http://i323.photobucket.com/albums/nn458/mx250syd/icons/welder.gif). Who'll run me off a copy 8).
-
verboeten'=
-
verboeten'=forbiddenin German.
-
those hubs again
-
BTW do you still have the blender ;D
I remember circa 92, simpler times, fluro was in and the 'nac nac' was the most dangerous thing you could do on a motorcycle.
-
Still got the blender Marc...She's undergoing a major rehash for the coming season.
-
Nothing wrong with black on the right bike, you selling em Firko ? talk to me if they are 36H im up to the Go black challenge,
-
talk to me if they are 36H im up to the Go black challenge
I don't know what you mean with the above Freaky. No idea ???
To answer your question though, I don't want to sell them and the anodizing is cactus on the rear one anyway after using caustic on it (don't ask, I flucked up).
-
NO probs, just need some 36 hole rims for the DT1, i could have lived with black. cheers anyway
-
I was given this article quite a few years back, the guy wanted a B & S replica arm to build the same project.
It will probably be hard to read on here, so right click on every picture & click "save as"
once saved on your hard drive you will be able to zoom in to ba eable to read sections.
(http://i15.photobucket.com/albums/a393/gmcloa/Superlight-1B.jpg)
(http://i15.photobucket.com/albums/a393/gmcloa/Superlight-2B.jpg)
(http://i15.photobucket.com/albums/a393/gmcloa/Superlight-3B.jpg)
(http://i15.photobucket.com/albums/a393/gmcloa/Superlight-4B.jpg)
-
(http://i15.photobucket.com/albums/a393/gmcloa/Superlight-5B.jpg)
(http://i15.photobucket.com/albums/a393/gmcloa/Superlight-6B.jpg)
(http://i15.photobucket.com/albums/a393/gmcloa/Superlight-7B.jpg)
(http://i15.photobucket.com/albums/a393/gmcloa/Superlight-8B.jpg)
-
Oh, the article was from 72 cycle world.
This is my replica arm of the B & S, I don't think I would want to replicate Marc's arm though, I would have to employ a first year apprentice to be able to design & make gussets like that :o
(http://i15.photobucket.com/albums/a393/gmcloa/YZMXswingarm001.jpg)
(http://i15.photobucket.com/albums/a393/gmcloa/YZMXswingarm003.jpg)
-
(http://i323.photobucket.com/albums/nn458/mx250syd/icons/wub.gif)How much?(http://i323.photobucket.com/albums/nn458/mx250syd/icons/wub.gif)
-
Bout a grand to build something like that, which I guess is why I have only built the one.
There was a lot of maching in those end plates which added to the "normal" cost of a swingarm.
I do have a spare set of those endplates though.
-
Wow that is Smick .
-
Wow that is Smick .
Yer nice job Mr GMC.
btw the PDI arm wouldn't be that hard as the end section is just a big plate with holes in it and a slot cut out to fit over the tube section at the front.
-
Oh, the article was from 72 cycle world.
This is my replica arm of the B & S, I don't think I would want to replicate Marc's arm though, I would have to employ a first year apprentice to be able to design & make gussets like that :o
Ah but my arm allows you to adjust wheel clearances or alternatively use shock absorbers ranging from 12" to 17" in length.
-
PDI arm wouldn't be that hard as the end section is just a big plate with holes in it and a slot cut out to fit over the tube section at the front.
The Hard part is replicating the cast pivot area as seen below.
(http://img.villagephotos.com/p/2005-8/1062154/boyd%20swingarm.jpg)
Ah but my arm allows you to adjust wheel clearances or alternatively use shock absorbers ranging from 12" to 17" in length.
Marc, if you're talking about the swingarm on the MX250, you're limited by the pre 75 rules of just about every country that had vintage MX which stipulate that you must use the original suspension mounting points and use shocks no longer than 1" over the original length. That cancels out the squillion shock mounts and allows you to remove the ugly fluckers. Believe me, your bike will look so much better without the gussets. B&S/PDI swingarms are quite attractive without the home made additions.
-
PDI arm wouldn't be that hard as the end section is just a big plate with holes in it and a slot cut out to fit over the tube section at the front.
The Hard part is replicating the cast pivot area as seen below.
(http://img.villagephotos.com/p/2005-8/1062154/boyd%20swingarm.jpg)
Ah but my arm allows you to adjust wheel clearances or alternatively use shock absorbers ranging from 12" to 17" in length.
Marc, if you're talking about the swingarm on the MX250, you're limited by the pre 75 rules of just about every country that had vintage MX which stipulate that you must use the original suspension mounting points and use shocks no longer than 1" over the original length. That cancels out the squillion shock mounts and allows you to remove the ugly fluckers. Believe me, your bike will look so much better without the gussets. B&S/PDI swingarms are quite attractive without the home made additions.
Nar .I think he was talking about all the holes in his swingarm - plenty of options there.
-
. That cancels out the squillion shock mounts and allows you to remove the ugly fluckers. Believe me, your bike will look so much better without the gussets. B&S/PDI swingarms are quite attractive without the home made additions.
I don't think they are home made at all, oh no, I think they are original and your swingarm has been hacked only leaving the front and rear as a pair of lugs. I would not desecrate my swingarm. It would be like pissing in the Sistine Chappel to hack away at art.
Now happily the Japanese have not yet taken leave of their senses and my bike is very welcome along with me. ;)
-
Hey Marc, do you see much trick stuff for sale in Japland?. You would think that they would have a fair bit, I'm sure Mr Yamamato san must have snuck stuff away over the years? or the factories have "extras" hiden away in some dis-used wharehouse that they have forgotten about?. From what I can gather by the mid to late 70's they stopped crushing them, cutting them up or dumping them into the North sea.
-
Set of works SR (works kawasaki) Kayabas came up the other day, but the USA is probably better place to shop with the Yen so high.
-
.... the guy wanted a B & S replica arm to build the same project.
Do you know if the guy completed the project?
I saw the original of that article 'back in the day' and it sparked my interest in lightweight as a performance enhancer. It's been in the back of my mind to do something similar even if it was to find out what it does to the performance. (The Monty conical hub/wheel looks like it will fit the MX swinger and is about 2kg lighter 8) (IIRC). Hmmmm, thinking, thinking, thinking ;D).
-
Believe me, your bike will look so much better without the gussets. B&S/PDI swingarms are quite attractive without the home made additions.
Actually believe it or not Firko I have 2 of these multi adjustment swingers, must have been production item. Imagine if you had one on an MX Harley, you could move them up to hill climb on Sunday and move em back for bike night on Monday
-
.... the guy wanted a B & S replica arm to build the same project.
Do you know if the guy completed the project?
I think so, like many of us he had a few projects on the go. Haven't heard much of him for quite a few years now. I think I built that arm about 5-7 years ago.
-
Heh Geoff I will swap you two genuine ones for your replica ;)
-
I have approached the Novation Swingarm subject twice. Once on this forum, and once on the previous version, before it got hacked. I likie the look of this hybrid and the Novation SWingarm. In fact I have had these pics on my website for a few years now. http://www.vmx.com.au/gallery2.htm
Short of it is that The Novation, or Marc's Swingarm are not accepted replacements for the real Yammy Part, so they are not accepted by MA, there for you cannot race in VMX classes or the nationals. Still, if you like the look, then go for it.
-
Short of it is that The Novation, or Marc's Swingarm are not accepted replacements for the real Yammy Part, so they are not accepted by MA
I don't quite get your point here. Marcs swingarm is most definitely legal as it's a real deal period PDI item. It might be ugly but it's totally legal so long as heonly uses the original shock mounting positions. The Novation on that bike however is ilegal by our rules because it doesn't replicate anything that was available back in the period. Novation do make damn good replica period swingarms but that particular item is not one of them.
-
oh too true, my swingarm rules and is the trickest thing you can get in pristine uncircumcised condition.