New Rider
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Posts: 35
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Joined: Feb 27, 2013 12:40:30 GMT -5
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Post by llib on Mar 30, 2013 11:55:10 GMT -5
I'm installing a 80cc big bore kit on my atm50 and i need to know
what the ring gap need to be at
thanks for any help
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Post by millsc on Mar 30, 2013 11:56:31 GMT -5
top .007 and bottom .009
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New Rider
Currently Offline
Posts: 35
Likes: 1
Joined: Feb 27, 2013 12:40:30 GMT -5
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Post by llib on Mar 30, 2013 12:05:54 GMT -5
thanks you were just the person i thought of first for the answer
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Post by millsc on Mar 30, 2013 12:11:55 GMT -5
heres a tip if you didn't do this already, put one circlip in the piston before you put it on the crank, the one thats hardest to get to when the piston is on the crank
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Post by triker on Mar 30, 2013 15:59:42 GMT -5
This is the mathematical formula to calculate ring end gap.
Bore in millimeters/25.4 = Bore in inches: 47/25.4=1.850
Top ring: Bore in inches x .004: 1.850x.004=.007
Second ring: Bore in inches x .005: 1.850x.005=.009
Roy
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