Question about 2004 Yamaha YZ 450 F

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YZ450 only starts when pushed started, once on header get's RED

I have a YZ450 that did not move for over 6 months no more than a year. I recently put in new spark plug, new battery, oil, coolant, etc...the electric start wont get it running but when i push start it it turns on. Sounds good but after about 10min the header gets really red and hot. How can I fix that???

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Your carb needs cleaned. Primary circuit or choke circuit are blocked. When you push start your bike and jump on it first reaction is to twist throttle. after it runs for a while the fuel mixture is incorrect and will make it run lean/rich which in turn heats motor up. I would guess rubber seal in choke circuit is stuck. If you clean carb it should solve your problem. Good luck and have a good ride.

Posted on Feb 03, 2009

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Hi Gabriel,
You have to check your cooling system!
with regards to the starter motor ...does it spin the engine when you hit the button?
Perform a compression test too.
Hope you have used the correct grade of engine oil .


Knight.

Posted on Feb 03, 2009

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