OK, the weekend before Easter I took my 450 out for the first time of the season, (I'm just now remembering additional symptoms which is why I'm doubting the route I took to fix the issue). The bike was running strong on the first ride, second ride I had a low RPM stall, I was probably just 1st gear putting along waiting on buddies to catch up when it happened. I think I had 3 or 4 more stalls almost identical to that one the, bike always fired right up after. Then the last ride I took, I was 3rd gear pinned hitting a pretty big dune and I had what felt like the kill switch was hit and the bike died. I looked things over and noticed my radiators were cold, so I removed the cap didn't see any coolant at that point I figured I had blown motor. I didn't want to make anything worse so I didn't try to start it just pulled it back to camp then got it home. In the garage I kicked it over and it and would fire for 1 or 2 seconds then quickly die. I still figured ether loss of compression or bad crank, I tore the motor down and the crank looked good with zero up down and barley any side to side play, piston and cylinder looked pretty worn but not blown at all. So I rebuilt the motor and sprung for a Cylinder Works 478 Big Bore and a set of Hot Cams Stage 1 got the bike back together and I'm still have a stalling issue. It will idle fine and just randomly stall, the stalls seem to become more frequent as the motor worms up
And I'm just remembering the bike died 4 or 5 times on my first trip. Before I had what I thought was a overheating related blown motor, maybe it was just another stall? I'v rode with people who have rode along way with no coolant in there YZ/YFZ's so Im starting to think the coolant was just a coincidence.
At this point I'm starting to think that the stator may be my problem and the stalls are electrical related especially since they are more frequent as the bike worms up.
Any input would or any experiences with intermittent problems with the 450 stator would be appreciated.