Re: porting a stock 103 jug...

superman /
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First thing i would to would be open up the exhaust a bunch, not in the window of the port, but where the exhaust connects.

Then after getting comfortable I'd open up the transfers by 1/2 cm on top and bottom.

Lastly, I'd split the case and open up the intake a bunch - my favorite mod.

of course this is all what i WOULD do, although i've never ported a stock cylinder, I've only done massive work on cases.

https://www.mopedarmy.com/forums/discuss/read.php?f=7&i=140596&t=140575

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