February 24, 201115 yr I bore them to have .002 clearance. Rotax recommend :- Clearance min 0.07mm max 0.09mm What's that in old money ?
February 25, 201115 yr Rotax recommend :- Clearance min 0.07mm max 0.09mm What's that in old money ? In old money .003 to .0037 ish You have to take to account what the engine is doing bore size and if its water or air cooled.some pistons also want more clearance due to type of alloy used. All in all I think down to the application.
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