OzVMX Forum
Marque Remarks => Yamaha => Topic started by: maxvmx on October 11, 2013, 09:34:59 pm
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Hi, I'm interested to know what parts are out there for one of these? I would like to buy and restore an original one so what would be the pit falls?
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Just about all parts are out there . Ive just finished one the hardest part was the oil pump side main seal could not find oem had to go after market . Iain
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There are oversize piston's US evilbay is a good place , Chrome molly was not used till 1978 on the YZ'Es so your stuck with steel . the shocks can be rebuilt a Trick kit was around in the day but they where never the best most changed to Koni or Girling . YSS make some lovely twin shocks from cheep to lots , you get what you pay for Ive got the top of the line for my race bikes and mid for show bikes . Iain
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Speed and Sport put one together that was almost completely NOS. it sold last year for less than $3500 US. Bargain I reckon.
Grahame
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As Grahame said they can fetch quite high prices but if your going to build from a wreck or box of bits think again no bs mine was 90% there and I spent close to 3k to rebuild and present prices would not cover what Ive spent . A few years ago they where selling in good nick at around 5k plus . They are not the best mxer from the era BUT they have a legend. Voted most evil Yamaha ever built by cycle world . they shared the same bike as the mx 250 ,360 the only difference was the motors , pipe , carby , and stickers . they also had electrical probs easily fixable with modern electrics . Once you get used to them they are a beast to ride they never behave the same way to the same conditions , but they have a collectors appeal they are now quite rare in original con and believe it or not now have a cult status . Iain
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Hi, I'm interested to know what parts are out there for one of these? I would like to buy and restore an original one so what would be the pit falls?
The last pit fall I had was of my RT1 at Nepean! How embarrisment!!
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It's easy to look back 40 years and assume that because the SC500 was the biggest bike in the Yamaha motocross range of the era, it therefore has to be the fastest. I've owned a couple of SC500s over the decades and I now know that while the SC500 is a weirdly quirky and fun bike, it doesn't hold a candle to its MX360 little brother as a racer. The 360 is an infinitely better (and faster) bike that is easier to ride, is softer on parts and is less taxing on the rider. With a change over to a DT400 ignition, some minor porting and minor suspension tuning the MX360 can be a remarkably competitive pre 75 bike.
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apart from paint and stickers they are so close you could not find any difference . Iain ps I think the silver is nicer .
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Check with Greg at Harrisville (Q) track. He has one that would suit a resto.
We had one lined up in NZ to turn into a hack but it changed hands (mysteriously) the week before we got to see it after being available for quite some time. It was a finished project for under 2 grand.
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Try Popeye on here. I don't actually have them.
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do they really believe what they wrote about the suspension.[imghttp://(http://i1284.photobucket.com/albums/a561/gbankier/sc500001_zps3d6cbcfd.jpg) (http://s1284.photobucket.com/user/gbankier/media/sc500001_zps3d6cbcfd.jpg.html)(http://i1284.photobucket.com/albums/a561/gbankier/sc5002001_zps1f203fb7.jpg) (http://s1284.photobucket.com/user/gbankier/media/sc5002001_zps1f203fb7.jpg.html)] (http://s1284.photobucket.com/user/gbankier/media/yams001_zpsff6a3480.jpg.html)][/img]
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There is one for sale on VMXWA web site right now.... cosmetically challenged.. but mech perfect..
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put one of those motors in a YZB frame though - awesome!
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don't go there . I once said the mx400 frame was the same so why not add a SC500 . what a shit storm that turned out to be . not pre 75 as the frame was a 75 . not pre78 as the motor was 74 and all major parts had to be 75 to 78 . so they decided it was evo hence there is a pile of mx400 and sc500 still sitting in my shed . Iain
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Drums' N Fins..............a '74............I raced one in '74.....Dirt Track not MX..........raced this one at Australian Classic Dirt Track Titles, Temora in October.........watch this space in Classic Pre '75 in 2014......i'm getting braver with every SCHOONER !!!
(http://i396.photobucket.com/albums/pp45/triumph51/IMG_0907_zps571ea20c.jpg) (http://s396.photobucket.com/user/triumph51/media/IMG_0907_zps571ea20c.jpg.html)
Photo Courtesy of Bill MacPharlane
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Iain - there are 2 that I know of in WA - SC 500 motor in a YZB frame - pre 75 no worries - and boy do they go ;D
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Ross the trouble I had was wanting to use a 75 mx frame . If by chance you find YZb frame in your travels I know a very good home for it . Iain
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don't go there . I once said the mx400 frame was the same so why not add a SC500 . what a shit storm that turned out to be . not pre 75 as the frame was a 75 . not pre78 as the motor was 74 and all major parts had to be 75 to 78 . so they decided it was evo hence there is a pile of mx400 and sc500 still sitting in my shed . Iain
Hmmmm......I can't see any reason whatsoever why it wouldn't be legal for pre 78 Iain. It'd take a brave and possibly very ill informed scrutineer to knock it back. The rolling frame is Pre '78 legal and while the motor is pre 75 legal it must go up to the next applicable division when fitted to the MX-B frame, that being pre 78. It's a no brainer....... Build it :D.
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I have a YZ250B frame I could let go....it has matching cases as well....pm me if interested. The MX250/400B frames are close to a YZ250/360B frame but no cigar.
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Hmmmm......I can't see any reason whatsoever why it wouldn't be legal for pre 78 Iain. It'd take a brave and possibly very ill informed scrutineer to knock it back. The rolling frame is Pre '78 legal and while the motor is pre 75 legal it must go up to the next applicable division when fitted to the MX-B frame, that being pre 78. It's a no brainer....... Build it :D.
Mark from memory I think it went to 7 or 8 pages and I got accused for trying to cheat into pre 75 , as the motor was not legal for pre78 cheating again . It all started with " if I built this what class would it fit into " type of question . :o :o :o :o
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I don't recall that thread but if the cyber experts decided that it'd be cheating using it in pre 78, they're quite frankly wrong. Of course you can't use the MX-B frame in pre 75 but it's only natural that the whole package go directly to the next division which is pre 78. The rulebook says under the engine criteria that MX,YZ,DT,IT 175-250 built between 1975 and 1977. Those who told you that the SC500 can't be used for pre 78 would have been taking the '75-'77 clause literally but I'll stake my reputation that if you showed up with the SC500/MX-B hybrid you'd be welcomed into pre 78 with open arms. Some folks take things way too literally. If the authors of the pre '78 rules had followed the wording used in the other divisions, ie"must be produced before 31st December 1976" there wouldn't be any confusion.
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i have a Sc500, mx360 or 250 for sale and probally as many parts. i will be keeping my 500 parts as i have one built to go in the sidecar which i was building prior to the accident so i still plan on finishing it even if out of bloody spite !
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Dont barstardize a YZB frame Davey for some other hybrid project. there are plenty of frames out there anyway to practice frankenstining on , id rather put a YZ motor in there and save it. PM what you want for it.
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Freaky - glad you are back mate! How are you travelling?
Now - what dates for next year?
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23/24 August. cant be moved any more as week later is state titles and we wont get the timing people, week before we can get track people. so club has said that's the date.
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Drums' N Fins..............a '74............I raced one in '74.....Dirt Track not MX..........raced this one at Australian Classic Dirt Track Titles, Temora in October.........watch this space in Classic Pre '75 in 2014......i'm getting braver with every SCHOONER !!!
(http://i396.photobucket.com/albums/pp45/triumph51/IMG_0907_zps571ea20c.jpg) (http://s396.photobucket.com/user/triumph51/media/IMG_0907_zps571ea20c.jpg.html)
Photo Courtesy of Bill MacPharlane
GO! GO! Alvin!!
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thanks Freaky
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When I worked for a local Yamaha shop in 77 a guy brought one in for a top end repair so we bored it to fit a new piston and put the top end back together, rode it around the shop to break it in for the guy. He brought it back a week later asking us if we were interested in taking it in on trade, he wanted a bike he could race without killing himself. The other mechanic purchased the bike from him and we used it to rip around the big field by the shop. Killer HP with a light switch power band but man would that thing throw roost. Scary fast, evil handling bike, both of us were racing at the time but were afraid to put it on the track.
I know what you mean about having a fondness for bikes nobody wants or have the reputation of being one of the worst...I just got done restoring a 83 KX 500. Now that I've got the head fixed (running the 84 head) the motor seems to pull very nice right off bottom and the back end works. Not to happy with the disc front end so I'm retrofitting a pair of 82 YZ 490 forks with the DLS front brake so I can bump down a class.
Enjoy the project!
Fritz
www.pnwvmx.org