OzVMX Forum
Marque Remarks => Suzuki => Topic started by: craigclayton on January 20, 2016, 11:54:35 am
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I've noticed on ebay someone selling an RM 125 b optional alloy swinging arm, can any of you suzuki experts tell me if it is genuine, to me it looks like it's off a C.
Cheers
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he he; here we go ;-)
It doesn't have the brake-stay arm mount, I'd say it's a 'C' arm.
Is that a crack running through the weld in one of the pics?
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Yes the one with the crack, looks to me the way its siting flat it doesn't have the brake stay mount?
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That's a Rm125C swing arm and not a B one as it does not have a brake stay mount. The 3rd pic is the bottom of it. It's definitely a C arm
And with that crack it's scrap alloy only
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Thanks for the confirmation, I'll just have to keep looking
Cheers C
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Craig, Do you have a swingarm for your B?
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Hi Ted, yes I have the original steel arm but have been looking for an optional alloy arm for a while. People tell me they do come up for sale but I am yet to find one :(
Cheers c
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I know of a guy with a brand new Suzuki alloy arm with the brake stay fitted from the factory. Would you be interested in it?
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Hi Ted, much as I would like to say I was interested I'm sure it would and should command a high but fare price for the wright buyer. I think some one building a a showroom bike the price would be fare and wright but I am (very slowly) building a bike to do my best and on a lucky day finish mid pack at a local race so to me and my not so perfect bike the price would be too high. I thank you for trying to help but will keep on looking (fingers crossed)for a used one.
Thank you and cheers C
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i would be intrested in the swingarm
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Its funny isn't it.
I always thought the RM125B option alloy swing arm was only permitted to be used if it was a genuine one. Also note these swingarms were also available and used in 250 & 370Bs too.
Anyway has anyone read the latest VMX Magazine. Apparently you can use a converted 125 C (C not C2) swingarm on a TT500 Yamaha in Pre 78. Its all there in black and white.
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Not sure how that is allowed? There is no 125 C2 anyway. I could understand a steel RM250C arm being allowed because it was also used on the 77 PE250, but there are several arms listed for PE-B RM-C but it seems to be just a chain tensioner mount difference and its a bit of a grey area as as to when the updated one came along and was shipped on PE250B's. Some could possibly argue that even the 250C arm might not be passable. I don't know how you could prove when the initial PE250B swinarm was superceeded by the RM250C swingarm with the spring loaded tensioner. Sometimes i think its too hard to prove or disprove these sorts of things these days. No one knows, no one remembers exactly, but the alloy C/C2 arms are an obvious no for pre 78, to me anyway.
What issue of VMX is that in? The latest one i have has got the SP511 on the front.
This one could probably be allowed if you could prove when the PE250B was being shipped with this eg before dec 31 1977
Part # = 61100-41850-019
Part Description = SWING ARM ASSEMBLY,REAR
Model Count = 3
PE250B 1977 246 PE250 DUAL PURPOSE
PE250C 1978 246 PE250 DUAL PURPOSE
RM250C 1978 246 RM250 OFF ROAD
This one probably should not be allowed
Part # = 61100-41880-019
Part Description = SWING ARM ASSEMBLY,REAR
Model Count = 1
RM250C 1978 246 RM250 OFF ROAD
This one also probably should not be allowed
Part # = 61100-41881-019
Part Description = SWING ARM ASSEMBLY,REAR
Model Count = 1
RM250C 1978 246 RM250 OFF ROAD
There should be no issues using this one
Part # = 61100-41841-019
Part Description = SWING ARM ASSEMBLY,REAR
Model Count = 3
PE250B 1977 246 PE250 DUAL PURPOSE
RM250B 1977 246 RM250 OFF ROAD
RM370B 1977 372 RM370 OFF ROAD
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What issue of VMX is that in? The latest one i have has got the SP511 on the front.
Check your news agent.
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what exactly is differant between the B and C swingarms other than the brake stay?
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125B - Steel
125C - Alloy
250B - steel
250C - steel
250C2 - Alloy
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what exactly is differant between the B and C swingarms other than the brake stay?
If you are talking the difference between a optional 125B aluminium arm and a aluminium 125C arm there are two things that differentiate. Three if you include the brake stay mount.
So simply welding a mount to a C arm will end in tears if the bike podiums. MA are fully aware of the differences and i believe will disqualify anybody found cheating.
For the information of all the optional arm weighs exactly the same as the standard steel arm when bolted to the bike. The only performance gain to be had would be to prove it didn't flex quite as much as the steel one. Clutching at straws there.
My advice would be to forget the alloy arm and spend your money on fitting the steel arm with no play at the swingarm pivot bolt, gusset the frame and getting your suspension set up on a dyno
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Ted ,,,, YOUR BAAAAACK !!!!!!!!
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what exactly is differant between the B and C swingarms other than the brake stay?
I understand that it is reasonably obvious once you look at the arms that the parts of each version of the swingarms are welded together in a different order (which parts sits on top and which weld was made first basically ie weld on top of weld or where they pass over each other) so that just welding a brake stay anchor on is obviously an addition as the 'C' arm was assembled without the brake bracket. The very early 125C's had the brake bracket in place and if you have a look at early promo photos the bracket is in place but not used but these swingarms are also slightly different again.
That is how it was explained to me by a local collector who has several of each of the three versions and also has the arm fitted to the Rahier bike that was here around the same time which is very different again.
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what exactly is differant between the B and C swingarms other than the brake stay?
If you are talking the difference between a optional 125B aluminium arm and a aluminium 125C arm there are two things that differentiate. Three if you include the brake stay mount.
So simply welding a mount to a C arm will end in tears if the bike podiums. MA are fully aware of the differences and i believe will disqualify anybody found cheating.
For the information of all the optional arm weighs exactly the same as the standard steel arm when bolted to the bike. The only performance gain to be had would be to prove it didn't flex quite as much as the steel one. Clutching at straws there.
My advice would be to forget the alloy arm and spend your money on fitting the steel arm with no play at the swingarm pivot bolt, gusset the frame and getting your suspension set up on a dyno
Ted You missed the point of my post. If you have the latest VMX Mag read the bike tests in there. While a C arm stands out on a RM125B when it is on something else it may slip through.
Of course the question now arises. If MA is going to allow replicas of components that were available back in the day, why isn't a modified C arm just considered a replica.
Also I see Manly fluked another win. Roosters were robbed.