rusefi.com

Hi
There is no stable synchronization during cranking - it can hit TDC correctly, it can miss by 90-180 degrees - full random.
If it hits TDC then the engine starts and runs great.

ECU alphax-4chan, Honda motorcycle four-stroke engine.
Crank - 36 tooth VR.
Cam - 1 tooth VR.
Additional capacitors are installed in both VR modules, adjusting the VR sensor threshold does not help.

https://rusefi.com/online/view.php?msq=1477

The 36 tooth trigger is not original, I also have the original 12 tooth trigger - same problems. I have logs for him too if needed.

instant RPM is definitely telling us _something_

I think I can see uneven duration of primary rise counter? Something is not right with hardware outside or inside of ECU At the moment we do not log tooth ratios for wheels without a synchronization point like this 36/0 so we are a bit more blind for such special wheels.

Here is a log with a 12-teeth crank and 1-tooth cam wheels.
From a factory, this motor comes with the 12-teeth crankshaft and a 3-teeth camshaft wheels (but it’s not available now).

Does it makes sense to remove 1 tooth from a 36-teeth wheel and turn on/off a camshaft sensor with the 1-tooth wheel?