Funny you mentioned the sensor position. When I received my 40 the screws were lose on the sensor bracket and it would flop from side to side. I thought no big deal I'll set it up according to the manual. Piston at TDC, 7mm from center of magnet on hub to center of sensor. With it setup like this it was hard to start, ran very poor, and got hot. I used a electronic infra thermometer and the temp ranged from 340 to 360. Way too hot! I stopped running the engine and called rcs. Mike Dooley told me don't go by that, it's way to retarded, he suggested going from the crankcase web center to the center of the sensor bracket 7mm. Also if you remove the sensor bracket at this location there is a mark on the hub right where the center of the brack sat. This places the sensor at the complete opposite range of adjustment then it was using the other method supplied. Strange. But now the 40 starts easier and temps are from 190 to 220. It still runs poor but not as bad. I will call him again tomorrow. Just thought this info might help someone.

Dave