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My GS550m has 0.5 oversized pistons. To calculate the service limits for bore and piston diameters do I simply add 0.5mm to the service limits of standard diameters?
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I'd go with that - in the absence of reliably sourced figures, it's as good a reference as any. As a guide, look at a manual for a model that contains overbore and ring tolerances for relative figures and see if they go out of kilter with the overbore size; 450, 650, 850, 1000, etc.---- Dave
79 GS850N - Might be a trike soon.
80 GS850T Single HIF38 S.U. SH775, Tow bar, Pantera II. Gnarly workhorse & daily driver.
79 XS650SE - Pragmatic Ratter - goes better than a manky old twin should.
92 XJ900F - Fairly Stock, for now.
Only a dog knows why a motorcyclist sticks his head out of a car window -
Measure the piston and bore per the service manual procedure.
Max piston to bore clearance = .120mm (.0047") (according to the FSM)
Can't find the reference in the FSM but a good rule of thumb is for there to be no more than .001" out of round or taper in the cylinder.Ed
To measure is to know.
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