Easy compression boost

Hey everyone.

I had a problem with a new replacement cylinder which was just over 1mm taller than the old. It came from a new factory so I am guessing that the head was 1mm shorter to compensate however I am stuck with my old head for now. Anyway I found a solution which has boosted compression to beyond my old cylinder.

Firstly I did away with the head gasket altogether! To achieve this I took the advice from some knowledgeable members here and used wen n dry glass paper to shave down both the head and cylinder where the gasket goes. To achieve a flat surface put a sheet of paper on flat glass and then using water gently rub the surface holding flat and firm. I shaved both surfaces flat and then using progressively finer grades of paper got these surfaces smooth as can be. This creates enough of a seal to do away with the head gasket thus boosting compression by making the combustion chamber smaller.

The second thing I did which I don't recommend unless somebody has the same problem was to do away with the bottom cylinder gasket acheiveing the same result of boosting compression. My bike now eats hills for breakfast

Nice! Soulds like between the gasket removal and lapping the head/jug you got it back to or better than stock.

Did you use any sealer at all on either joint?

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If it ain't broke, and you mess with it long enough, it will be.

Just tested it this arvo and boy does it fly! Definitely a bit more powerful than stock! Very pleased with the result. The engine seems to run smoother too am wondering if losing the bottom gasket has changed the port timing for the better.

I used gasket silicone on the bottom but nothing on the head however I sanded those surface baby smooth and dead flat. No leaks after the first test run. Such and easy and effective mod I recommend it to everyone.