Crank Position Sensor
Riddle me this Mr. Mike. I lost my crank position sensor (CPS) last week. Upon installing a new one, I now find out that my timing is too advanced and/or running lean. For the last year and a half (2000 FXD w/ two front heads, now 110 ci) I have been running just about as much advance in the motor as my SE adjustable ignition will give me (curve 1 with 5 degrees advance). At 10.3 static compression (9.3 CCR) I thought that this much advance was a little strange, and have been running 135 main jets in my two HSR45s (you "coached" me on the jetting, as I was freaking out about too small jets). So I get the bike going again, haven't changed anything but the new CPS, and it's detonating really bad. I'm now on curve 3 (more retarded with respect to curve 1) and am slowly advancing timing up from there. I may be able to fatten up jets also. So here's the questions: Why would changing out my CPS cause my engine timing to need to be changed? When the old Hall sensor was working, could it have been giving a "poor" reading resulting in too much advance? Where the timing is now (curve 3) makes much more sense to me based on experience at this compression ratio.
As before, I remain indebted to your willingness to help me. Your knowledge and experience are rare.