Posts
533
Joined
11/30/2010
Location
Marietta, GA
US
Mx746
7/11/2017 8:50am
7/11/2017 8:50am
Edited Date/Time
7/11/2017 5:32pm
Hi folks. 95 cr125.I found a good amount of slop in the upper "cushion arm bolt" (long bolt that goes through swingarm) . The bearings and bushings are new. The slop is between the bolt and new bushing. It's a lot of play at the rear wheel with bike on stand.
The bolt is very slightly worn, its odd that it creates that much play at the wheel. So, I'm looking for a source for the bolt 90128-kz4-710 these are discontinued from Honda. Wondering if there is an aftermarket option other than rusty eBay parts?( I also found play between the bolt and swing arm bosses. Is that normal, or is the fit supposed to be zero play from factory?)
Suspension bolts don't have to be 'bearing fit' tolerence like wheel spindles, as the system relys on the clamping force from the bolt being tightening to hold the centre bush/pivot tight for the bearing to work.
Sometimes the slot in the swing arm where that pivot point fits can get worn (or some times the center pin or collars can be a smidge shorter than they should be) and with the big lumps of alloy of the swing arm each side, the bolt simply won't pull them in enough to pinch the pivot up tight, causing the clunking and play which you can hear and feel at the wheel. The geometry of the suspension linkage means that the wheel movement is scaled down for the shock to control, in reverse it magnifies the movement. There's maybe only 0.06-0.12mm of movent on the actual pivot point, but at the wheel feels HUGE!!
I can make a new bolt with a tighter tolerence then the original (Titanium or Stainless) but i'm not sure it would cure the issue. I'd pull the 'arm off and measure the mounting slot, the pivot pin, and the collars. (Use a pair of vernia scales and a micrometer) A slightly thicker pair of collars or a shim behind them may do the trick, and would a lot cheaper than a new bolt!!
Stevie
Maybe I've done myself out of some work, but I would feel bad if it' was not the bolt causing your issues!!
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