Topic: Swing Arm

[Dion]

Hi Guys,  Need help here. I’m busy dry assembling my Cr replica before I paint, however I have an issue with the rear wheel and the spacers. According to the workshop manual I am using the correct spacers, however I have a gap between the spacers and the swing arm. Does anyone know the correct measurement between the swing arm legs? The picture that I attached has been joined in the middle so that one can accurately see what the issue is.  Thanks guys.

[Sam Green Racing]

Dion, are you mixing parts, have you got an F arm and early K wheel ?

Sam.

[Dion]

Hi Sam, hope u feeling well bud. Yip I think i am. I bought 4 sohc bikes and stripped all to get the best parts. But i don't know what the actual sohc swing arm measurements  (Width) are? Can u help at all?

[JohnN]

My K2 & K6 swingarms measure 9-1/2" (240 mm).
John

[Dion]

Thanks John. I'm going to measure as soon as i get home from work in the next hour. Forgot the measurement at home. This having to work is playing havoc with my hobbies

[754]

Late K andF arm does not have a bolt thru the removeable end piece.

[Dion]

Hi Guys, the pic that i previously posed on this thread, the Swing arm in the pic is about 265mm +/- 2mm wide.
I went and found all the swing arms that were in the bikes that i stripped and I am attaching a pic of those units to this post.
The Oval unit measuring 240 mm is the one that was in the bike that i am currently building when i bought it. I don't want to use it because all the pics i c of the CR has the rectangular swing arm in them.
Your thoughts are greatly appreciated. Thanks. How do i rectify this?

[Dion]

My build so far.

[Sam Green Racing]

Looking nice Dion. The biggest problem with mixing parts is not getting them to fit but getting them to line up.
I'm taking a guess here as I'm not 100% sure but on the A F and later K models, the gearbox sprocket was about 5 8ths of an inch further out from the cases than the early Ks. The swing arms were cranked out further to the left to clear the chain and the top suspension mount was longer on the left had side to line up with the one on the cranked out swinger.
The rear axle was longer and they had a sprocket carrier that was wider to allow the chain to line up.
You need to check all your part to make sure you have the correct ones.
Your swinger looks like it's from one of the ones I mentioned above. Drop a plumb line down from the top left suspension mount to see if it lines up.

Sam.  

[Retro Rocket]

Looking nice Dion. The biggest problem with mixing parts is not getting them to fit but getting them to line up.
I'm taking a guess here as I'm not 100% sure but on the A F and later K models, the gearbox sprocket was 10mm further out from the cases than the early Ks. The swing arms were cranked out further to the left to clear the chain and the top suspension mount was longer on the left had side to line up with the one on the cranked out swinger.
The rear axle was longer and they had a sprocket carrier that was wider to allow the chain to line up.
You need to check all your part to make sure you have the correct ones.
Your swinger looks like it's from one of the ones I mentioned above. Drop a plumb line down from the top left suspension mount to see if it lines up.

Sam.

Fixed that for you Sam...

[754]

Looks like a 77/78 arm to me.  Wider.. Longer..
 The early swingarm had the drilled hole and the axle plate was forged with raised adjustment marks.
 The latest one has steel plate (cheaper) axle mount with stamped in adjustment marks.
 If it is a late arm off a K, the brake arm attach bracket is similar to the early ones.. The F one has the attachment on the top side..

[Dion]

Thanks for the help guys. Going to do some more measurements and post an update this evening

[Blackfin5]

Had exact same issue....I had mixed hub/spacer parts from different models.