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Old 06-19-2009, 11:26 PM
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MikeJ MikeJ is offline
Motorized Bicycle Senior Member
Join Date: May 2009
Location: Colorado Springs
Posts: 82
Default Re: Engine top end rebuild and an engine stand

Hi Norm -

New guy and new purchaser here. A question about head nut torque, please... I was checking the new 66cc Nantong engine, fresh from factory (unpainted model). The head nuts are 10mm. I used my own moment-arm and weight system as a calibrated torque socket wrench: A rachet handle with light copper pipe extending horizontally outward. I have read that head torque should be 12 ft-lbs (8 pounds at 1.5 feet). But I measure the headbolts and I don't even think I am getting 6 ft-lbs of torque resistance. I tightened each headbolt nut about 10 degrees and stopped. I am not getting the resistance I am expecting. I have to wonder if the studs are stretching, the head gasket is compressing, or the crankcase threads are stripping. What has been your experience when tightening down headbolt nuts?


Last edited by MikeJ; 06-19-2009 at 11:29 PM. Reason: Don't want moving icon in middle of message
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