There is a play between con.rod big end and crankpin. The new engine is about 0.01mm~0.02mm.(every mfg. has its tolerance) When the play become bigger and bigger,you will feel it more serious.
All racing engine should keep it under 0.05mm. Engine for practice or just for fun,you can keep it under 0.1mm still ok(don't run too lean). When it become bigger than 0.1mm,its time to maintain it.
Last edited by dino.tw; 09-19-2004 at 01:55 AM.