Originally Posted by LarryLebel
I don't get the "taking it passed TDC" concept. Once passed TDC there's no spark for another 720 degrees of the crank rotation. I figure you feel resistance at the bottom of the compression stroke and with the decompression lever you advance the piston to just before TDC not after.

Do you start a single like that? Strange.

We use the decompressor to get past TDC at the end of the compression stroke so that the kickstart imparts nearly 720 degrees of acceleration on the flywheel, to carry it over the the next compression stroke.