Question about Harley Davidson XLH 1000 Sportster Motorcycles

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I have gas in the oil tank and the rear cylinder is not working

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Sounds like your float needle is bad in the carb, your check valve is probably bad, letting both oil and gas mix in the cases. You need to change oil and filter. It's probably curb in the carb for the rear cylinder, take it off and clean it.

Check the compression in each cylinder if the engine still won't start or run properly. Begin by removing the screws on the front left and rear right cylinder covers using a standard wrench. Carefully pull and remove the cylinder head covers. Remove the spark plug caps for the spark plug in each cylinder. Using a spark plug wrench, twist each spark plug counterclockwise and remove from its cylinder. Insert a compression gauge into one of the cylinders and operate the electric starter. The gauge should read between 140 and 160 lbs. of pressure. Repeat for the second cylinder. Take the bike to the shop if the compression reading for either valve was significantly less than 140 lbs.

Also couple different reason for your rear plug to be fouling. , you could have a weak plug wire on the rear cylinder. General rule is to replace them every 3-5 years. There could also be corrosion in the coil plug towers, causing a weak spark. If so, replace the coil and wires.

This is also a symptom for an intake air leak. The carb could be jetted too rich to compensate for an air leak. To check for this, warm up the bike to operating temp, remove the air filter and use a can of Brake Cleaner with a straw to spray directly on the intake flanges at the head with the engine idling, if you hear any change in idle, they are leaking and need replaced.

Please get back to us if you have further query else please accept the suggestion.

Thank you for contacting

Posted on Mar 30, 2011


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