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 Topic: Raising an MC21's rear 







Hermit

 
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Hermit » Mon Oct 12, 2009 3:28 am

Yeah, on the MZ i first dropped the forks through the yokes to experiment with low C of G versus clearance of the exhaust header off the front wheel. I think i settled on 50mm of stanchion tube showing above the top yoke in the end. Next i took the forks to bits and machined the damper rods down and re-drilled the oil holes slightly smaller to increase damping resistance (just to experiment). I also grinded the springs down to suit. The result of this was that the forks were shorter overall and i could keep my new geometry without having 50mm of stanchion tube sticking up through the top yoke. It also meant that because the fork was shorter overall with less distance between the wheel spindle and the bottom yoke, there was less leverage exerted on it during braking and cornering so it flexed less. It also seemed to ride better too - probably because more of the energy going through the fork was being put into compressing the springs rather than bending the forks.

We next made up a fork brace and made our own top yoke out of aluminium for it. I carried on experimenting with fork oil volume/air gap but the engine fully terminated itself at Silverstone soon after and put an end to the project.

Playing with suspension settings and frame geometry is alot of fun. I'm keen to hear about damo's findings when he tries the new link plates on his bike.
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