Nohoff said it only uses the flywheel for initial start up and after that it go’s by rpm for the timing slope if I remember correctly
From the way I see it on the saw, the only way RPM can be determined is by sensing position of the flywheel/crank. More than likely there is some confusion between the timing for spark with the timing for the injector.
Advancing the flywheel may also trigger the injector 6 or 8° too early....right into the face of the intake skirt lol
Won't dropping the cylinder potentially have the same effect, Kevin? I'm curious how the injector timing and the spark timing are separately determined. My brain goes directly to crank timing.
Offsetting the cylinder up/down, would change the port timing, which could cause the injector to potentially spray fuel at the incorrect time also.
In order to optimize port window availability, an adjustment in fuel delivery may be mandatory.
it uses the acceleration of the crankshaft while the piston goes up/down to specify the correct ignition timing and the flywheel key is only for the first start up to get the engine running.
It doesn't seem possible that spark isn't directly relevant to crank position. I would agree that injector time can vary according to RPM.
The piston moving up and down in the cylinder isn't visibly metered by this saw. In other words there is no piston position sensor. The only way to determine RPM is via crank revolutions (i.e, RPM's).
I'd like to get my hands on Stihl's "theory of operation" files.