Re: Anyone ever port an outboard?

Mark Booth /
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An outboard is a totally different type cylinder than the moped engine. Maybe the new ones are different but the ones I had and worked on had the loop scavenge designed cylinders. This is where the pistons, which look way different than a moped piston, had a top to push the intake fuel air mixture to the top of the cylinder and the exhaust was pushed out with what is called a loop flow. Opening up the ports will have adverse effects on the engine. I tried this on a junk engine so many years ago. messed a little with the ports and it never ran after that. I did not even do that much but it was enough to kill the engine.

Just my 2 cents worth.

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