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Crank position sensor

Yamahas know for coil to go bad

Leave fibers and steels in place use TDC bolt to lock motor and put in gear to take basket nut on/off no need for tool

if bolt is visually worn replace , more likely bearings how many total hrs on bike?

If sat for awhile. You can have a brand new clean pilot in it, if the body passage is still blocked no fuel or little. Clear passage Backfire, could be timing

You had no change after adjusting valves. Then had backfire after or before adjustment? With unknown hrs, (decent amount)- needs new piston Shop should have given you % of leak down to help determine if new piston or valve job. Yamaha-ck spark plug cap

Graeme Brough - Torrance

Unplug ECU and reconnect, if starts once - then dead / bad ECU or bad spot in wire harness Must have 12 volts out of battery test w volt meter

ck valves and timing

Don't know if Rental still makes the bend, but the Jimmy Button bend is a tall bend.

need new clutch pack even at 35 hrs Everyone uses it different from the next guy

Just listened to vid. Did you take power valve apart for top end? or just pull complete cyl and head together. Sounds like powervalve stuck or not connected to diaphragm. Pull pipe put finger in to manually move valve.

Look at the ground wires to the motor. You should have two connectors bolted in the same spot. one from coil an other from stator. I found working on three of these at the same time the coil wire(small eyelet)must be against the case first. It took many hrs taking things apart and swapping parts to make them run like...

First , you have gone through most of the common parts. Post a picture of how the connectors are bolted to the case for ground. Could be the issue. A worn needle in carb have been known issues. Spark plug boot.

AEO in Murrieta is a New KTM-Husky dealer and a WP service center like its AZ shop They also are offering trackside support at local So Cal tracks You can call to find out what track they will be at to cover your needs for parts or service. They support top amateurs and Pros and Industry.

WPS 490-2526

Is the flywheel weighted?

The US map is leaner for EPA reasons

Try Proven Moto, Race Tech, If you can get a dealer to drop the Euro map in it you'll be good.

Pull all connections apart and use contact cleaner and compressed air. Since you are going to take the connections apart use dielectric grease around the connections. If that doesn't work and you still get backfiring, then it may have jumped time on the cam. Check timing marks