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Old 06-14-2013, 06:42 PM
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Tool Maker Tool Maker is offline
Motorized Bicycle Senior Member
Join Date: Oct 2012
Location: Las Vegas, NV
Posts: 86
Default Re: machine new cylinder?

Buy a new cylinder. Accept the fact that they are never round, and the plating is atrocious.

Take the new cylinder, de-grease it. Put it in your oven, and cycle it to 300 degrees a few times. Let it cool to room temp each time. Do any porting or clean-up it needs before the next step.

Then, put it in a box, add $230.00 and a new piston (for fitting) & ship it to:

They will bore it back to straight, then Nikasil plate it & hone it to size for the supplied piston.

Nikasil works. Porsche still uses it in aluminum cylinders.

I have sleeved 2 stroke engines. It is a huge pain in the backside. Making all of the transfer ports line up right, getting the sleeve pressed in to the right spot, finish machine work... Then you still need a good bore & hone to straighten up the bore after you get it assembled.

230 bucks is a bargain. If it is within .010 of round after heat cycling, they will only charge $198 if they don't have to bore it.

Just my two cents, based on experience.

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