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Originally Posted by bennelson

The 300D flywheel is heavier, though, isn't it? How would that effect engine performance?

I am also not completely clear on a flywheel being balanced to the engine or not.

Actually, I believe they're the same part, but even if it's a little heavier, it will just rev slightly slower. The difference won't be much, if any (~3lbs max).

The balance thing, you just look for a nick mark on each piece, and line them up when you mount the flywheel to the crank. There should be a nick on the crank already, and whatever flywheel you get should also have a nick on it. If either doesn't, you don't have to worry about it.