how much to be bored out?

[twitch101]

just came onto a 3 wheeler myself and before changing the oil it didnt smoke "that" bad but after i changed it seems to be worse. how much does it usually run to have it rebored and how far should i go? what kind of places bore engines like this for you?

[JohnR.]

Bore it as little as possible to clean up the cylinder.

[twitch101]

was looking at maybe a 20. or is it that these top ends are hard enough that it just collapses the rings?

[daniel_250r]

mine was 60 to get bored out and about 60 for the piston. it will run forever even tho it smokes i just ran old motor oil in mine self recycling

[JohnR.]

Without knowing what piston is in there what machine you have there is no way anyone could give you an answer to your question and even then, without opening the motor up and checking the cylinder there is no way to know how much you will need to bore. You need to pull the top end off, bring the old piston and cylinder to the machine shop, and have them tell you what overbore you need. Are you sure its the rings that are worn and not bad valve seals or something? If you're gonna do the piston you should do a valve job while the thing is apart.

John

[twitch101]

not entirely sure about what to get done. i havent really bought it yet. its on loan. i believe its a 200es motor. nut sure on year but i know i helped him transplant the engine to a 185s frame from 1982.