SOHC.co.uk Forums > CB500/550

swopping CB500 yokes for NSR125 ones

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matthewmosse:
I have an ns125r in the shed - wonder how close this would be? I know phisically a cb250 or 400 front end of the superdream era slot streight in too.

Ewan 500 K1:

--- Quote from: matthewmosse on June 15, 2014, 10:09:40 PM ---I have an ns125r in the shed - wonder how close this would be? I know phisically a cb250 or 400 front end of the superdream era slot streight in too.

--- End quote ---

Got this on the US site: " I'm in the process of organizing a set of these for another forum member. Because the NSR top clamp is flat & not "dropped" like the original the forks need to slide through the lower clamp enough to sit flush with the top of the upper. This ultimately brings the top of the fork leg closer to the bottom of the lower clamp reducing available travel. I need to play some more but may mean longer tubes or else the front of the frame will be lower. This might be ok except if there is already a change to an 18" wheel as well as longer rear shocks. If this is the case longer forks or tubes may be the answer, otherwise too great a change in rake & loss of trail will result even with 10mm less offset.

The OD of the steering stem where the lower bearing sits is smaller than the original so in order to use tapered roller bearings for a Honda it will be necessary to machine a sleeve for that lower brg".

I've just started looking at this so I have no final advice yet. Otherwise the fork spacing & diameter of these triples is correct.looks a lot more complicated that a straight swop or simple mod of steering stem ! Cb250/400 solutoion probs not an option given the £'s alreay laid out on wheel and brake refurbs. Now think a one off CNC billet job might need to be the answer ... though that would take a fair bit of saving for

Trigger:
Ewan, i think Norniron jacked up his back end on this 400, give him a shout. I know hes a shy boy but, he knows this cafe stuff. Washers is always worth a try and cheap. You never know until you try.

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