OzVMX Forum
Marque Remarks => Suzuki => Topic started by: spicydave on January 08, 2010, 05:53:31 am
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Hi All,
Thought I share my restoration with the AuzVMX crew out of sunny South Africa
Bought the bike as a RM100
When I saw the bareel it was marked "123cc" so I thought I'll make it a 125
Herewith the before pics:
(http://i282.photobucket.com/albums/kk265/spicydave/100_0499.jpg)
(http://i282.photobucket.com/albums/kk265/spicydave/100_0500.jpg)
(http://i282.photobucket.com/albums/kk265/spicydave/100_0501.jpg)
(http://i282.photobucket.com/albums/kk265/spicydave/100_0502.jpg)
And the After pics:
(http://i282.photobucket.com/albums/kk265/spicydave/100_0552.jpg)
(http://i282.photobucket.com/albums/kk265/spicydave/100_0544.jpg)
(http://i282.photobucket.com/albums/kk265/spicydave/100_0545.jpg)
(http://i282.photobucket.com/albums/kk265/spicydave/100_0549.jpg)
(http://i282.photobucket.com/albums/kk265/spicydave/100_0550.jpg)
(http://i282.photobucket.com/albums/kk265/spicydave/100_0546.jpg)
(http://i282.photobucket.com/albums/kk265/spicydave/100_0551.jpg)
(http://i282.photobucket.com/albums/kk265/spicydave/100_0537.jpg)
(http://i282.photobucket.com/albums/kk265/spicydave/100_0538.jpg)
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very neat Dave, love the personalised numberplates too
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Dave , It's come up a treat and I see you have a big block also ;)
With your plastics are they painted ???
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A nice tidy unit Dave. I use the parts bike building philosophy/practice also..'tis fun to keep em' guessing just what exactly it is I reckon ;D
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Looks the business, but starting point wasn't a total pile of scrap, thats cheating ;D
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Nice work mate, thats how I started too, an RM 100T with a 125 barrel plonked on top. Nothing was done to alter the stroke which remained at 50mm instead of 54mm, but it actually ran, albeit with not much power. I now have a 125 crank to yield the full 125cc capacity. Correct me if I am wrong, but I think you have the exhaust and muffler mounts in the wrong positions, ie; the rear mount (steel) at the front and the front (aluminium) mount at the rear, this might lead to the exhaust burning through the top of the air box if there is bad positioning or insufficient clearance? I also make it as a a 1980 "T" model, given that the chain is running on a solid nylon buffer, rather than the roller mounted atop the swing arm as the 1979 "N" model does. I have also upgraded the suspension to 125 specs, as in 38mm forks and triples to match and aluminium swing arm with reservior shocks. All said, there is great parts interchangeability between the 125 and it's little brother. I reckon these bikes are a trip to hoon around on, do you race yours?
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Dave , It's come up a treat and I see you have a big block also ;)
With your plastics are they painted ???
Hi Oldfart,
No the plastics is new from Vintage-Suzuki
Very good/ solid 4mm thick
Shot
SD
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Nice work mate, thats how I started too, an RM 100T with a 125 barrel plonked on top. Nothing was done to alter the stroke which remained at 50mm instead of 54mm, but it actually ran, albeit with not much power. I now have a 125 crank to yield the full 125cc capacity. Correct me if I am wrong, but I think you have the exhaust and muffler mounts in the wrong positions, ie; the rear mount (steel) at the front and the front (aluminium) mount at the rear, this might lead to the exhaust burning through the top of the air box if there is bad positioning or insufficient clearance? I also make it as a a 1980 "T" model, given that the chain is running on a solid nylon buffer, rather than the roller mounted atop the swing arm as the 1979 "N" model does. I have also upgraded the suspension to 125 specs, as in 38mm forks and triples to match and aluminium swing arm with reservior shocks. All said, there is great parts interchangeability between the 125 and it's little brother. I reckon these bikes are a trip to hoon around on, do you race yours?
Hi Rocketfrog,
I do not know about the positioning but that is how I bought the bike
Clearance is enough between the airbox so I hope it does not burn
I'm in search of a ali swingarm but nothing as yet
Shot
SD
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You are right rocketfrog...front mount to the rear and rear to the front.
My RM125T is running the 100 top end and crank as the previous owner blew the bigend and decided to put the RM100X bits onto it.....I got all the original bits with mine including the 100X bits and pieces,but i want to put it back as a 125.....so i'm chasing a rod kit or a good 125T crank.
I kept an eye on a 125N crank.....but T crank part numbers are different.....any idea why??
Anyway....spicy dave......nice job on the bike....i assume you are waiting on a new clutch cable as it should run behind the pipe up along the frame downtube like your original pics.
I like it
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I have a very similar bike, I think the 100 and the 125 shared the same stroke, cause mine is a 100 with a 125 kit. i think the 100 had a steel swingarm and the 125 had an alloy one. I ran mine on dirt track and it was really nice to ride. It has a downpipe, Courtesy of Craig from Granville.
Cheers Brett
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RM125 bore and stroke 54mm x 54mm
RM100 bore and stroke 50mm x 50mm
Topend and crank fit in either bottom ends
Steel s/arm in 100's and alloy in 125 from '78...'77 optional
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I know about the clutch cable that must be rerouted
Still need to that
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Shot
SD
Dave,
The mob here won't have a clue what "shot" means (used in this context of course ::))
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Shot
SD
Dave,
The mob here won't have a clue what "shot" means (used in this context of course ::))
Sorry
Cool
SD
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Hey Monaro, i think you are correct. maybe i am thinking of rm100a and rm125a.
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We'll my bike is now complete
I have a full set of original plastics if anyone is interested, including the tank (Secondhand)
Cool
SD
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Hey Monaro, i think you are correct. maybe i am thinking of rm100a and rm125a.
We are both right....lol ;D
RM125A 56 x 50mm and RM100A 50 x 50mm
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You are right rocketfrog...front mount to the rear and rear to the front.
My RM125T is running the 100 top end and crank as the previous owner blew the bigend and decided to put the RM100X bits onto it.....I got all the original bits with mine including the 100X bits and pieces,but i want to put it back as a 125.....so i'm chasing a rod kit or a good 125T crank.
I kept an eye on a 125N crank.....but T crank part numbers are different.....any idea why??
Anyway....spicy dave......nice job on the bike....i assume you are waiting on a new clutch cable as it should run behind the pipe up along the frame downtube like your original pics.
I like it
Monaro, I do not have an 'N' crank to compare the difference, but I do know that the 100 and the 125 "T" share the same con rod, the only difference in the crank seems to be the crank pin being positioned further toward the circumference of the counterweight by 2mm to give additional 4mm stroke overall. Crank pin, bigend brg and rod are all the same part number items. If you still have the 125 crank then the rod, pin and brg are still available from Suzuki, a bit cheaper from Alpha sports than local, especially if you have a list of bits to complete the rebuild and make the additional shipping costs bearable.
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little forward movement on my 78
(http://i245.photobucket.com/albums/gg71/marcFX_photo/Marcsnewtoy003.jpg)
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Thanks rocketfrog for the info.
I keep an eye out on and see NOS rods from the US but never find crank pins....i should get off me butt and just order the lot and get it assembled.....just gotta work out what to do with the bike and whats worth spending on it.
The 125C is still sitting in the lounge room unstarted and i will possibly have a PE175 floater coming in the next week or 2.
A mate is interested in the T as long as it goes back as a 125....then factor in the crank rebuild etc etc.
Hey marc...i thought a watercooled was going in it??
Looking good though!
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little forward movement on my 78
Ouch! that Simons magneto cover is worth its weight in GOLD.
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little forward movement on my 78
(http://i245.photobucket.com/albums/gg71/marcFX_photo/Marcsnewtoy003.jpg)
Nice,
I like the rear swingarm
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Nice swing arm!
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Nice swing arm!
thank god someone does ;D
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Ouch! that Simons magneto cover is worth its weight in GOLD.
[/quote]
its all in the detail stuff, plus I bought I good motor.
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Guys,
Sometime back the 100 Vs 125 engine issue was covered, basically advising that a 125 crank won't fit into a 100 case set. Whilst the 100 crank will fit into the 125 case set, the swept volume of the crankcase is all up the shizenhouzen and the bike would have no power. Whilst i am 100 correct on the C model (as i have both engines and have checked it) I am not sure about the N and T models, but i would suggest that you check before you go buying bits and fit i wont work.
Rod
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Thanks Bahnsy for that info,good to know that.
I reckon N and T model might be ok as both the 100 and 125 cases have the stroke dimensions of both capacities cast into the left side next to the c/s sprocket.
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monaro308,
Don’t use that casting as a guide, the C model has exactly the same information cast into the side but the cases were different internally.
At a guess, the castings start out exactly the same. The 125cc cases are machined to take a large diameter crank web and the 100 remains the base case. I looked into having the 100cc cases machined out to take the 125cc crank (it's only 2 or so mm) but i found it easier to track down a set of 125cc cases from the good old US of A.
Bought and shipped was less then the cost of the machine work.
And another warning. The N & T cases, whilst they may look the same as the B & C cases, the stud arrangement for the mounting of the barrel are completely different. Got burnt with that one as well.
Rod
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Yeah i had a play around with my 125 T barrel and head to compare on my C rebuild....stud pattern different and the spacing at the reed base area up the shite.....not only that,the rear case mount holes to mount an N,T engine into a C frame dont line up and vice versa.
I will take note of the crank diameter diff in the cases......actually now that you mention it....i have the 100 cases that came with the spare 100X and the 125T top end and crank that came out of the 125 bottom end.....i'll do that later as its about 43c outside....even the spiders in the tin shed have to move
out of their hiding spots and rest in their webs....lol
I will sit the 125T crank in the 100X case and see if it fits and note the clearance.
I will also report back on the 100 topend and crank that is on the bike when i pull it down (oneday) and note that too for info on here.
Thanks Rod
Cheers.....Mario
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Mario,
I was able to build a good engine from a 125 and a 100 engine for my RM125C, mainly because the gearboxes are the same, so never pass up on a cheap 100cc engine for that reason alone. The biggest issue that I found is locating a barrel that wasn’t completely rooted. I am 2.0mm o/s and only just at that. I will keep looking for a good barrel that will bring back to somewhere around the .05/1.0 o/s but I am not that fussed as I only use the bike for classic Dirt and Broadford type events.
Rod
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Thanks Rod,the 100 seems to be the forgotten child for donor parts to its big brother....especially those important tranny bits.
Now...because i'm an impatient prick and keen to answer the question on this subject.
Here is My cooking lesson for the year.....Master chef has nothing on me ;D
First you take an RM100X left side case....
Place it on the concrete (next to the shed in my case) is fine.
(http://i199.photobucket.com/albums/aa250/hjcoupe/cook1.jpg)
Turn the Melbourne weather control to 43 deg C (slightly o/cast is ok )
Cook for only 10 minutes on said concrete....
(http://i199.photobucket.com/albums/aa250/hjcoupe/cook2.jpg)
Remove crank bearing from the freezer which was placed in for only 2 minutes
and slide into LH case...no force is needed,just drop it in.
(http://i199.photobucket.com/albums/aa250/hjcoupe/cook3.jpg)
(http://i199.photobucket.com/albums/aa250/hjcoupe/cook4.jpg)
Now place that RM125T crank assembly into the RM100X case and take photos and dimensions for future reference for the OZVMX public.
(http://i199.photobucket.com/albums/aa250/hjcoupe/cook5.jpg)
(http://i199.photobucket.com/albums/aa250/hjcoupe/cook6.jpg)
This RM125T crank webbing measures @94.34mm
This RM100X case measures @ 96.25mm
Looks like we have a YES on both engines being interchangeable as long as you have the crank,barrel and head from either engines.
PS....Sorry Spicydave if i highjacked your post...thought i'd keep it with the RM100/125 theme.
Cheers....Master Mario ;D ;D
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Mario,
The biggest issue that I found is locating a barrel that wasn’t completely rooted.
Rod
Thats where the Japanese parts are good, my engine arrived with good compression and standard bore ;D
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PS....Sorry Spicydave if i highjacked your post...thought i'd keep it with the RM100/125 theme.
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No worries,
I like to see that there is more little RM's from that era that gets reborn ;)
Cheers,
SD
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my 125t is almost ready now that been a project and a half
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Why was idle bearing not replaced ???
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Why was idle bearing not replaced ???
My bet is - a bugger to get out of you don't have any tools. ;)
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Why was idle bearing not replaced ???
Oldfart were you refering to my crank and case pics?
If you were....this was just a mock up to answer our own question of 100/125 compatability.
That 125T crank will eventually get a rod kit and go back into the bike to bring it back to a 125.
If it wasn't....just ignore my post ;D
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"Looks like we have a YES on both engines being interchangeable as long as you have the crank,barrel and head from either engines."
Monaro, nice one for clarifying the 100/125 interchanges, really useful. Was just wondering ,especially as people wanna have STD 125 bores to work from -can ya not just bore out an RM100 barrel to 54mm? Maybe it's too short (compression issues/ ports won't line up??)
Currently doing an RM100X with 125 forks,wheel and swingarm/shocks by the way
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RM 100 Barrel is shorter by 4mm, but a spacer under the barrel and possibly longer studs may make the switch possible. There looks like enough meat in the liner to bore to 54mm.
Also check out TF 100 and 125 for interchangeability, Lozza mentioned that customising the ports on a TF100 may be just the way to go if you want to build up hot 100 donk. Although I have not looked into it myself, it might be worth looking at if you have a TF engine to compare the two. I would be interested to hear from anyone who has looked at the possibilities.
The idler bearing can be removed with a split collet extractor and slide hammer readily enough, but using the "old pack with grease and drive out hydrauically trick" did not work for me.
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RM100/125B/C parts interchange with the TF100/125 models not RM100/125N/T or 100X ;)
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Cheers Doc, I have never seen a TF in the flesh, they are an Ag bike are they not?
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can ya not just bore out an RM100 barrel to 54mm? Maybe it's too short (compression issues/ ports won't line up??)
You could probably bore the 100 cylinder to 56mm(makes a 125) if you want to and the barrel spigot is willing.You have to reprofile the ports again but that's no real drama. The TF cylinder will allow you to run more modern ports(which give more and a better spread of power) and having a cheap endless supply of cylinders.
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Cheers Lozza thats good to know about the TF cylinder.
I assume they are of the same era to the RM or did the TF cylinder continue on to the late 70's and beyond with that same cylinder config? (i haven't seen one).
As for the idler bearing removal.....i throw mine in the oven (or wait for that Melbourne summers day ;) )
and lay a sheet of masonite on the ground and slam the case flat....it falls straight out.
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The TF100/125 is basically an identical engine to the TS100ER and TS125ER built from about 1978 onwards...
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The TF100/125 is basically an identical engine to the TS100ER and TS125ER built from about 1978 onwards...
Yes it was marketed as the Mudbug .... or slug take your pick, against the mighty Yamaha AG range.
Ask TMBill he is a worlds authority on them. You could get 125 and 185 versions from memory. Came with all the comforts of home like long range tank and carrier for your bovine companion. Highlighted technology has to be the lockable clutch, saved selecting neutral.
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Marketed as a Mudbug in UnZud only Mark ;) they were sold here in Oz simply as TF farm bikes and they were tax exempt to the man on the land. As for comparing performance to the AG Yamaha's you'd have to ask a farmer :D
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Marketed as a Mudbug in UnZud only Mark ;) they were sold here in Oz simply as TF farm bikes and they were tax exempt to the man on the land. As for comparing performance to the AG Yamaha's you'd have to ask a farmer :D
I still have one of the clutch levers on my TM/TS185.... in case I want to open a farm gate or shoot a pig or something. These days the man on the land is on a 15 grand quad or Gator, no great call for ag bikes anymore.
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New Zealand speed dating :D
(http://i245.photobucket.com/albums/gg71/marcFX_photo/Peakplunge9.jpg)
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Very nice :) :), had a RM125N back in 1980 and race junior 125’s good bike, I raised the compression by replacing the 1mm (copper) head gasket with a 1/2mm one, we moved the ignition 2° retarded I think. Than added DG reeds, port job, and an electron carbi.
Engine was slow until she came on hard, I could be last off the line and second in the first turn. Wish I kept the carbi, traded the bike at Savage Suzuki in Perth.
P.S love the RM500 in the back ground, rare horse.
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Can you forward on brake stay rod length centres that bolt's go thru ( at brake drum & chassie ball joint ) 0n a Rm 125 T please.