Question about 1988 Suzuki DR 750 S

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Fuel in the crankcase

I have an 06 Suzuki 400 Eiger Quadrunner. When it sits for a week or so, fuel leaks into the crank case. After changing the oil & filter and starting the 4x4 every day, theres no problem. After it sits for a couple of days and I pull the drain, fuel and oil pours out. Any suggestions?

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It sound like your fuel shut off valve is bad and the needle valve and set may need to be cleaned.

Posted on Mar 24, 2010

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Take the gas cap off and tear the check valve off the bottem of gas cap. when it sits heat builds presure in gas tank and fources it past carb and leaks past rings.check valve is for rollover you really dont need it .i had 2 atvs 1 filled crank case other filled breather box.

Posted on Sep 14, 2009

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I would say it is a carburetor float issue either the o rings that hold the float in are bad or the float needle is not seating properly also be sure your fuel petcock is set to on and not prime.

Posted on Jul 01, 2009

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Your float valve is sticking - the carb fills up, the fuel runs out through the carb into the engine.
Get a new float valve, until then - turn the fuel off at night.

Posted on Jul 01, 2009

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Air box and crank case fuel flooding problem happened before, thinking it was stuck or worn float needles; I installed 2 Carb float needles left side facing rear of carbs , all larger main jets, all...

Well there only one way the fuel can get into the crankcase and that's from the fuel tank. The petcock must be draining and the float needles are not stopping the fuel flow. Do you have a prime position on the petcock? If so do not run the bike in the position. Try topping the tank off with gas and letting it sit for a while and see is the gas has gone down and then check the crankcase and see if there's fuel in it again. i still say its got to be your petcock.

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Always turn the fuel petcock off when your not riding the bike.The cocks leak and the fuel flows through the carb. through the intake, into the cylinder, past the rings and into the crank. This is possible death to your top end. The fuel washes away the oil on the cylinder wall !
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