engine size, size does matter

80cc broke in 44 tooth 33mph but motor was screaming swhinn speedo waiting for piston to come flying though my leg thats why i would like to try 40 tooth but hate to mess with the bike 800 miles with no promplems yet! 20 to 1 gas
 
80cc broke in 44 tooth 33mph but motor was screaming swhinn speedo waiting for piston to come flying though my leg thats why i would like to try 40 tooth but hate to mess with the bike 800 miles with no promplems yet! 20 to 1 gas

What is a good break in oil to gas ratio?
 
16:1 after about a gallon, start working your way to 20:1 - 25:1

before you start the engine... pull the spark plug out and squirt a little oil in the hole. Then cycle the engine through a few times w/out the spark plug connected to the cdi. You can either do this by removing the clutch lever/sprocket cover and manually rotating the engine with a socket wrench. Or if the engine is hooked up to the chain and rear wheel just roll the bike forwards a couple of yards.
 
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16:1 after about a gallon, start working your way to 20:1 - 25:1

before you start the engine... pull the spark plug out and squirt a little oil in the hole. Then cycle the engine through a few times w/out the spark plug connected to the cdi. You can either do this by removing the clutch lever/sprocket cover and manually rotating the engine with a socket wrench. Or if the engine is hooked up to the chain and rear wheel just roll the bike forwards a couple of yards.

Also what type of gas should I be using?
 
adding to vtec, remember that higher octane is not better. higher octane gasoline is used in really nice cars because it is actually HARDER to burn, and this quality prevents their high compression ratio engines from knocking. These engines are "designed":giggle: to burn very simple fuel.
 
adding to vtec, remember that higher octane is not better. higher octane gasoline is used in really nice cars because it is actually HARDER to burn, and this quality prevents their high compression ratio engines from knocking. These engines are "designed":giggle: to burn very simple fuel.

Any certain number? Like 89 or anything?
 
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