Im tring to rebuild the top end of my blaster but dont know the size of my piston it has a number on the top it is 67.17 so that meas thay i have to get a 68mm????
Help with piston size
- Thread starter Jonathan t
- Start date
Piston size is determined by bore size. If you have a scope, measure yourself. Otherwise, take it to a shop and have them measure it. They'll also tell you if you need a hone, or a bore on the cylinder.
Buy a 68mm piston kit for that have them properly size the bore for to proper piston to cylinder clearence and proper ring end gap you'll have it then. You also have them chamfer the ports on the cylinder, to do away with possible ring snags
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You might not have to go up to a 68mm! Have the shop check it first a tell you if the cylinder needs boring and if it is Round.
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