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Problems running 100mm head gasket in 102mm bore

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I've heard non-OEM head gaskets can leak, so I'm hesitant to use a non-OEM 102mm head gasket.

 

How bad is it to run a smaller head gasket? The piston wouldn't hit it because the deck never gets up to the top of the sleeve, but what other issues would there be?

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Theres plenty non stock gaskets that are fine as long as you install it correctly. Sequence/torque specs...

Cometic being one of my choice

There's no problems there that would stop you, but dont you want that area as open to make power as possible? Youre robbing yourself more than the amount of time robbed from you to wait on a correct size gasket.

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Probably not the best situation but I've done it before. No problems to report.

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I phoned a guy, about 1-2 years ago, that made copper head gaskets & sounded attractive. I'm not sure if this is the guy. He had the patterns for our thumpers. https://coppergaskets.us/                or maybe this one?     http://www.headgasket.com/preinstall.html

  What I did like was the fact that they were reusable, after annealing them. Wish Cycle Wizard was around for input here. Anyone one else tried & have feedback in the use of the solid copper HG s?

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I've use them on many motors.  A thinner gasket raises your compression and on a 4-stroke it retards the cam timing equaling more top end power. 2-strokes you can double gasket the cylinder and use the thinner copper gasket to keep your compression. The raised cylinder changes the port timing  giving more top end power also.

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