I pulled the radiator fan cowling and the fan. Got down in there and noticed that that one of the bolts holding the position sensor bracket was loose. Tighten it up and the 535 seems to be running better. My question is how do you adjust the sensor. I see that the distance from the sensor to the notched wheel is 1mm + or - 0.3 mm. but I don't see any way of adjusting the distance. It appears there are two bolts holding the sensor mounting bracket to the engine but I could only remove one. How do you get to the other bolt? Remove the notched wheel? I also noticed that the sensor is held to the bracket using a allen wrench bolt how on earth do you get to this puppy? Is this the bolt to perform the adjustment?