Re: Front fork problems
I having a big problem on my front suspension. I replaced the ohlins FG329 fornt forks on my CBR929RR, everything is fine for the first 500 km, afterthat it causing a unexpected vibration during braking sometime, but it is not always happen.....sometime happen braking during corner, sometime happen just stop front of the traffic light during braking, sometime during gentle braking around 60-120km, sometime happen in high speed around 220+ km.
The FG329 is design for 04-07 CBR1000RR, but it can direct fit on CBR929RR, only the caliper mounting bracket is different, so I put the 06 CBR1000RR radial calipers on.
The vibration very like a kind of bottom out and chattering, I tried to turn the compression all in and all out and/or turn the rebound all in and all out, the result are similiar. When the compression setup is harder, it happen less than b4, but not sure it really the sourse of the problem.
I sent the suspension back to local distributor, they also can't find out the problem, even dismantle the FG329 forks to check it. They say maybe the radial calipers causing the problem and they going to put a new pair of Brembo calipers to test it.
On the other hand, my original CBR929RR forks was modified with Racetech gold vale kit and springs, it running well for 800km but it did happen the same problem as Ohlins. So I dismantle the forks and check carefully, find out the one of the compression check valve is not operate smoothly, can it cause the unexpected vibration problem? or the braking frequency affecting the valving operations? or other problem?