1 K100 and K75 front wheel bearing preload Sun Mar 20, 2016 3:42 am
rawdonball
Gold member
I have finally forced my old 'older' brain to comprehend (I think) what I am actually doing when I tighten the bolt which screws axially into the left hand end of the front wheel mounting shaft.
Went looking on the Forum for confirmation - TWB puts it well in his 'Big Block' blog around post 35
To help get my head around the design concept, I had to remove the wheel from my K100RS and thread the axle through the left hand fork eye from inside to outside. Then I slide spacer, wheel bearing, spacer tube, wheel bearing, and other spacer onto the axle. The distance from end face of axle to end face of last spacer, was what one normally sees to end face of left fork when screwing in the axial bolt with bevel washer on normal front wheel assembly. The more one tightens this axial "spacer clamping" bolt, the closer the two bearing inner races will be to each other (by the amount that the inner tube sleeve is compressed)
When I fit the new wheel bearings to my front wheel I'm going to see if I can detect additional bearing drag after TORQUING the M10 x 20 bolt...
Has anyone noticed a variation
Until I understand this better, this is one bolt I won't be doing up "BY FEEL"
Went looking on the Forum for confirmation - TWB puts it well in his 'Big Block' blog around post 35
To help get my head around the design concept, I had to remove the wheel from my K100RS and thread the axle through the left hand fork eye from inside to outside. Then I slide spacer, wheel bearing, spacer tube, wheel bearing, and other spacer onto the axle. The distance from end face of axle to end face of last spacer, was what one normally sees to end face of left fork when screwing in the axial bolt with bevel washer on normal front wheel assembly. The more one tightens this axial "spacer clamping" bolt, the closer the two bearing inner races will be to each other (by the amount that the inner tube sleeve is compressed)
When I fit the new wheel bearings to my front wheel I'm going to see if I can detect additional bearing drag after TORQUING the M10 x 20 bolt...
Has anyone noticed a variation
Until I understand this better, this is one bolt I won't be doing up "BY FEEL"
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'88 K100RT, '86 K75C, '05 Yamaha TTR250