jack_the_lad Posted February 24, 2011 Report Share Posted February 24, 2011 I bore them to have .002 clearance. Quote Link to comment Share on other sites More sharing options...
b40rt Posted February 24, 2011 Report Share Posted February 24, 2011 I bore them to have .002 clearance. Rotax recommend :- Clearance min 0.07mm max 0.09mm What's that in old money ? Quote Link to comment Share on other sites More sharing options...
jack_the_lad Posted February 25, 2011 Report Share Posted February 25, 2011 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. Quote Link to comment Share on other sites More sharing options...
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