Got a small issue on my 2011 YZ 450. Has 50 hours on it. Took it out last Saturday for about 30 min and ran good. Right when I was almost done riding It died at idle. No big deal. Started it up and ran it for a minute. It died again under 1/4 throttle while riding it. Started it up again, all the times it died it took about 10 kicks to get her going. Did this no matter what I did for about 10 times. The last time it did it it wouldn't start back up for anything.
I brought it into my garage at that moment. Pulled the spark plug. The spark plug is about 2 hours old. Iridium NGK spark plug. It had rust on it. It would kind of wipe off. I looked down at the piston with a light. It had rust on it also. Never seen anything like ti before. Decided to pull the top end apart and found this...
Please tell me what you think. Gonna take my head to the local moto bike shop. Have them check the head out and valves.
EDIT: That one valve that is black should have rust on it origionally but I wiped it off.
Edited by F0Xryder61, March 07, 2016 - 07:34 PM.