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Tr280I Piston Clearance


ric h
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Hi Ric,

Piston/bore clearance in imperial units should be between 1 to 1.5 thou, I have the spec in mm somewhere and converted it to units that I understand better and can remember, but can't find them just now. Measure at the front or back of the piston skirt about a third of the way down from TDC.

I have never seen specs for piston ring end gap for the Ossa, it will be the same as a 280 GG, safe to have 4 to 6 thou.

I have had to replace a piston/cylinder that was nipping up from new, turned out it was tight from the supplier at half of a thou, no wonder.

Bye, Peter B.

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