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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
JR50 top end assembly and injection to premix conversion
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[QUOTE="jeddclampette, post: 743458, member: 51717"] If you torque it those 10mm nuts down to 40 or even 30 ft lbs, you may shear the studs from the head. Torque no more than 25ft lbs. max. I'd go w/ 17ft lbs and leave it at that for starters. After the bike's runned in, you can go bak and retorque to 22ft lbs max. This engine's merely one step away from a push lawnmower engine. As far as tricks go on putting it back together, 2 things come to my mind. First, locate the arrow on the piston. Be sure that when you go to assemble the rod and bearing into the piston, the piston arrow points to the exhaust port. Second, there's two piston rings that go on the piston groove. Be sure the gap opening of one piston is not colinear w/ the opening of the other one. overlap/cross them so that there is no loss of compression. Also, be sure your ring gap opening is twisted away from the exhaust port. The gap could catch onto the exhaust port and break. same caution applies to the intake port as well. Disclaimer: I'm recalling from memory...I can be wrong in the details. So please do your own research as well. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
JR50 top end assembly and injection to premix conversion
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