ORIGINAL: 3136
When reversing rotation is the idea to turn the cyl and piston so the sequence of the fuel vapour through the ports is the same as it would have been if the engine was running in it's normal rotation?
Exact. But also compression is the same than. If you leave the cyl and piston and just position the ignition sensor to the opposite side you will have increased compression and need to richen the needles a lot and still end up with an engine that is just not running ok.