SOHC.co.uk Forums > CB500/550

Knocking forks

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mick:
Hi Ian let us know how you get on  ;) mines doing it on one fork leg think i'll give it a go to  ;) cheers Mick.

Ian DB:
Had a go this morning and no difference, easiest way to see whats actually happening is to pull back on the bars while its on the stand and the forks extend to their max and knock as I assume the damper rod is still hitting the top of the damper although its so hard to pin point where the clunk comes from.

There is no tension on the forks when the bike is on the stand and its easy to remove to top cap without fear of it shooting out of the fork tube.

Could it be that the damper and/or springs are shot? and would ATF oil instead of the 10-30's fork oil i've used?

There is no real knocking when rocking the bike backwards and forward so long as you hold the brake on hard. still knocks with the brake on slightly. This might settle down as the pads settle in?
 
Ian

Green1:
O yeah you just reminded me I changed my springs as they were about 10mm shorter then the min recommended length and that was what sorted it on the 750.Sorry I wasted your last half hour :-[ The top cap is now a pig to put in and it takes your eye out now when it's undone
It was my Triumph that was knocking because they were twisted.I seem to have a memory of a goldfish lately  ::)

Ian DB:
No worries Mick, it was worth a try anyway. The springs are well within tolerance, but must be tired. Will look for replacements in due course.

Ian

bomber:
Any luck with the forks? Have you fixed it?
Mine where knocking on braking, it started after I took spacers out, think new springs are needed.
 

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