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I have a friend who is rebuilding a 43cc APC mini chopper engine and I am wondering what the torque specs are for the 4 M5 cylinder bolts are? I’m guessing it’s about 8 foot pounds as a general rule of thumb, but I would like to know for sure.
Anyone know what the torque specs are for this?
 

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I don't have a spec I tighten them as tight as I can without striping without the base gasket and just a very light coating of silicone then I check them after brake in.
 
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