Question about Yamaha YZ 450 F Motorcycles

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Yz450f carb Gets gas in oil after I get done ridding, what's the problem an how do I solve it?

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Sounds like the carb floats are sticking.
Allowing more fuel to enter the combustion chambers than can be burned off. Have the carbs checked/services asap.
The air/fuel ratio must be right for the engine to perform at peak performance. Hope you are changing that oil too!
Good luck

Posted on Mar 28, 2014

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Yz450f


Hi, Anonymous for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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First, try to avoid ethanol. It melts carb lines, and can goo up small passageways. Get some good gas and try again. Hi test if necessary. Check your specs, maybe the bike requires hi test.
Taking apart and cleaning involves soaking in fresh carb solvent to clean the small passageways. Is there an air cleaner? It may be clogged, test with it off.

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Hi, Anonymous for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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I have a 2007 YZ450F. It's pretty much stock and I run it at an alttitude of 5500 ft. It's been running fine since I've owned it but for the last few months I've been experiencing...


Possible water in the carb float bowl. Go over a whoop and a bit of water gets picked up and into the engine. Water doesn't burn well. The water is condensation from the gas tank. Try draining the carb and see if that helps. Also be sure the spark plug cap and battery terminals are on securely. Check the side stand kill switch to be sure it is securely mounted. Please rate my answer. Thanks! tombones49_167.gif

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Just as Alaska bratt says check your carb. I had gas leaking into the oil and the entire engine was destroyed. Gas dilutes the oil and then there is no lubrication. FYI don't be worried about gas/fire as the gas is also diluted and is not very flammable, with gas it is the fumes that are highly flammable. I recommend rebuilding the carb draining the engine oil and keep your fingers crossed that you didn't damage the piston/sleeve/cylinder.

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  • Lets do the basics first. Shut off the gas then remove the water trap from the petcock ( gas valve ). Clean the trap then drain the carbs. This will eliminate any water in the fuel system.
  • Now it gets a bit tougher. If the fuel system is not the problem then it sounds like time to remove and clean the carbs. The carbs could have varnished up over the winter. Since you have the carbs off, Consider a carb kit. After all, the bike is 14 years old. Main jet seals could be the problem as opposed to varnish. Be sure to balance and sync the carbs after installation.
This should solve the problem. Please rate this solution after all is done. Thanks.

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