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We do not really use a specific head-torque measurement/fixation. As for the crank-conrod specs, the best thing is only to measure the crank-pin which when new measures 5.02mm and you should not go under 4.99mm
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rody thanks 4 crank o.d. what about rod i.d also my motor sucks dust through the head and case solved the problem with a o ring found lots of chatter marks from machining tool or part is moving to fast i use high speed steele for clean up cuts on special parts and lower rpm i know carbide last longer enough negative the motor runs great very fast consistant temps and most parts have very little wear after 2 gallons 20% maybe 1 tenth are you useing oil impegnated bass 4 rod bushings and what are your thought an useing a needle bearing insted will send pictures of case if you would like ive seen this problem cash a motor already is this common im new to the gas thing but i read alote and have friends who have raced for years they dont have the dirt problem thanks for your prompt reply the toolmaker
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