Question about 1981 Yamaha XJ 650
Posted by Anonymous on
Hi, Anonymous and the usual suspects are:
1. Damaged or restricted fuel tank venting system.
2. Loose float bowl screws.
3. Damaged float bowl o-ring.
4. improper fuel level in the float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
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Posted on Jun 20, 2016
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Posted on Jan 02, 2017
Hi ...... Sounds like float levels are set too high or debris in float chamber. Switch petrol off from/at tank and drain fuel from float bowls, if you use the cap off a paint can etc you can catch it and look at it to see if any water or debris present. Retighten drain screws, switch petrol back on and see if it still overflows.
Posted on Dec 30, 2008
sounds like you got a cracked gas line or it needs a clamp on it,1.if it a line running from each carb. that is the overflow lines.2.if its one big one coming from the breather box it is a catch holes, and you open it to let whats in it run out.
Posted on Mar 27, 2009
Sticky float needle valve probably caused by dirt from the fuel / tank or accumulated fuel gum build up. Try tapping the float chamber. Failing that pull the float bowl off and carefully clean/ flush with carb cleaner spray.
Posted on Mar 23, 2010
If I understand "the petcock was in prime position and it eventually quit dripping."
Prime = on
Sound like the needle rubber was hard and after a while they soften up enough to cut off the fuel.
Keep an eye on it and ride safe.
Posted on Feb 03, 2011
Tips for a great answer:
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When a fuel injector is stuck open, the fuel will flood out. Gasoline will definitely get into the oil when this is the case.
If the fuel pressure in your car is too high (above 7 psi) that may cause gasoline to get into the engine oil.
Gas could also leak into your intake manifold if there is a carburetor problem.
An inoperative injector system can also cause this problem, because if the engine is not firing appropriately, the gasoline will end up running down the walls of the cylinders.
Check to see if the float in the gas tank is rising the way it should be rising or if it needs an adjustment. You will not be able to look at your gas gauge and get an accurate reading If the float is not functioning properly.
Your engine may be running rich, with too much gas going into the engine and too little air.
Check to see if the oil level might be really high. This can also cause trouble
Two ways to tell if you may have a problem with gas in your engine oil are:
1. If you start to smell a strong odor of gasoline while you are driving.
2. You notice white clouds of smoke coming out of your tailpipe.
If a large amount of gasoline does get into the engine oil, change the oil immediately upon fixing the problem that has allowed this to happen.
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