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Fuel problem gas geting into my oil,gas and oil pumping into air cleaner through vent tube that connects from air cleaner to block

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The float needle and seat is leaking. When the bowl is full, the needle and seat is not shutting off the flow of gas. It flow up into the carb, down the intake, past the intake valve and piston rings into the crankcase. The needle and pressed-in brass seat need to be replaced.

Posted on Jul 03, 2009

  • t-makaveli Sep 04, 2011

    I had the same problem. But I can almost guarantee the aforementioned solution is not going to fix what's happening in your case. Here's what's most likely going on. The tube in the air cleaner housing, where that oil/gas mixture is shooting out of, actually connects to the "crankcase breather" (little rectangle box that is bolted into your block). What is most likely the cause of your problem is a blown head gasket between the cylinder, and the push rod valley. This causes oil from that valley to be sucked into the cylinder on the intake stroke, (thus mixing with fuel), and then get pushed back out into that valley on the compression stroke. This explains thee oil/ fuel cross-contamination. The reason it "spurts" out of this "crankcase breather" tube, is because the blown head-gasket is allowing all the pressure from the pistons compression stroke to enter into the crankcase, via the push rod valley, and force this oil and gas mixture out of the crankcase through the past of least resistance. Which in this case, happens to be through the crankcase breather tube. Hope this helps anyone with the same problem I had.

  • Vicki Kinchen Jun 10, 2012

    If I unplug the connector at the bottom (bowl) of carburetor will that keep gas from continuing to flow into carb. when not running? At least until I can get a shut off for it.

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I had the same problem - actually more than one problem:
1) Floats in the carburetor bowl (at the bottom of the carb) are getting stuck. Remove the carb; carefully disassemble the bowl & float assembly (pay attention to gasket orientation and don't lose the needle valve that the float-tab presses on!); use a carb cleaner from AutoZone or similar, and a toothbrush to clean all the parts. If carb is not too dirty, leave the jets and mixture-adjust screws alone (otherwise will have to re-adjust later).

2) Overflow tube is plugged (hence fuel in the cylinder instead of on the ground). Clean both ends of the brass-looking tube from inside and outside the carb bowl. Make sure you can blow through it or it is still plugged. Toothbrush and carb cleaner should do the trick. Replace the short flexible tubing that connects to the overflow on the outside of the bowl - transparent polyurethane tubing is less than $1 per foot at your local ATV/motorcycle shop.

3) Air Vent tube is plugged. Same thing as the Overflow tube but mounted higher up in the carb (not in the bowl). Clean it the same way and replace the flex tubing with another short piece of polyurethane.

4) Make sure the float-tab and needle-valve move smoothly. Mine was catching and getting stuck so I carefully "polished" the face of the tab with 400-grit emery paper, and then made sure to clean the area from grit. Smooth as a hot knife through butter now.

5) Set the float level by CAREFULLY bending the tab that pushes on the needle valve. On my 1981 175MX, float height spec is 21mm when just making contact with the needle. Yours may be different though.

6) Reassemble the carb after making sure all dirt and debris are gone. Use a new bowl gasket or at least put a good gasket-sealer compound on the old gasket. Attach the short lengths of transparent polyurethane tubing to the Overflow and Air Vent. When installing the carb, the Air Vent tube should just be 2" long and point out to the side; the Overflow tube should route through the frame near the swing-arm and point down to the ground.

7) MAKE SURE the Oil Feed tube coming from the AutoLube oil pump is connected to the carb (brass-looking fitting toward the cylinder-end). I replaced mine with transparent polyurethane tubing (different size than the Air Vent and Overflow), so now I can see that oil is being presented to the carb!

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