250-500cc heat causing my '11 wr300 to cut out and stall. what could it be

For the TMX, just run the stock (GAY) needle on the 4th clip, 35 pilot, 410-420 main. Should be good enough for a test ride.

What year did they switch ignitions? I thought it was 2012 for some reason, if so your 2011 and his 2014 would have different systems. I could have that year wrong, though. Actually, now that I think about it, it was 2010 right?

Correct. 2011 and newer bikes have the Ducati ignition with the coil and cdi combined into a single black box, which makes checking the coil somewhat problematic.

Thanks for the jetting specs guys. I have the upgrade jetting kit that came w/the 2011 bikes so I'll set it up this weekend as best I can.

When I did some testing a few nights ago I got 12v at the brown wire between the stator and the regulator w/the bike running and the regulator plugged in (this is an AC system only). I did not test the coil voltage. How is this done? Also, what should the coil resistance and stator resistances be (primary and secondary)? The workshop manual does not provide data. Using a power drill w/the plug out I was able to turn the flywheel fast enough to measure 18 volts on the brown wire to the regulator (w/it unplugged) and 8 volts on the red wire that feeds into the coil. The lights and dash also lit up when doing this. The workshop manual says that it should be 35.5V at the brown wire, but I don't know how you're supposed to get the engine to 3000 rpm w/the regulator unplugged as it states to do.

I had a similar problem with my 2011 250, turned out to be the stator. What seemed to 'trigger' my problem was giving the stator a good blow with compressed air. Maybe the knock to your exhaust was just enough to finish yours off.

You can drop by and I'll let you borrow stuff. Maybe just take electrical measurements from mine to see if different?

Hey Crocus Paper, how did you diagnose your faulty stator? Was it heat related like mine. Was that all you had to replace?

Shrubitup, maybe later this week I can come over after work to take some measurements and compare to what I've taken so far? I'm waiting for my flywheel puller to show up in the mail sometime this week so I can pull it and check out the stator and take a few more measurements. I'll bring a growler of libations from Walts . Shoot me a pm w/your address and phone # and we'll set up something.

I cheated. Electrics turn my brain to pulp. I suspected the stator or coil, took it to a main dealer and he put a new stator on it and that cured it. It was a random intermitant problem for six months before I had a hard fault.

my

on my 2012 wr 300 the stator was replaced under warranty after seizing twice[repaired under warranty,not a jetting issue]and that improved starting but it seized again.i replaced the voltage reg/rectifier after the auto elect tested entire ignition.the auto elect explained to me that the faulty/shorting out reg/rec was causing the spark to go to ground the most direct route so the spark [plug] was all over the place causing no spark/spark/weak spark and causing seizures

How can no spark cause seizure? detonation from pre-ignition maybe, but seizure?

no spark means no heat in the engine, and if piston moves up and down, you should have lubrication..

It's not the no spark but faulty ignition timing (too much advance) causing kickback on start up and detonation while running. Timing and poor fuel quality problems are often misdiagnosed as lean condition when someone is looking at the aftermath of a engine failure.

Makes sense Doug.
BTW, nice to see you round here again.

Update: faulty stator was the cause of my stalling issues. It looked fine to me so it was likely the trigger as Bill at BMP suspected. Thanks Bill! Put a new stator on last Sunday and went on a hot and punishing ride at green and gold mountain filled with ridiculously difficult hill climbs. Really got the motor loaded and hot with not a single issue. My steed performed flawlessly. It even starts easier even with the headlight and speedo hooked up. Thanks everyone for your helpful insights. I appreciate it.