Question about kawasaki VN 2000 Classic LT Motorcycles

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Engine oil appears to be discharging through the air breather. Came on all of the sudden and seems to foul the breather within a short period of time. Rode about 20 miles and stopped within half an hour there was at least a cup of oil on the ground. any thoughts???????????

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Check your oil level . If it is too high smell the oil to see if it is fouled with gas. If your carb needle sticks the carb may over flow filling the engine. When the engine is too full the breather blows the oil and gas into the air box. Another way to get gas in the oil is if the fuel petcock malfunctions and pours gas into the intake manifold. If the diaphragm of a vacuum petcock gets a hole in it , the engine may flood with gas. The gas flows into motor and past the rings. If you look under the engine in front of the rear wheel you may see a tube with a plug in it. Place a pan under the tube and pull the plug. It is a pollution tube for emptying the crud out of the bottom of the air box. Some Honda's used to fill there engines with gas randomly. If it happened you just changed the oil & air filter, and kept on driving. It just happened for no logical reason. So check your petcock and carbs for problems, change your oil and air filter, and always turn your petcock off when not riding.

Posted on Aug 30, 2010

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This is a common problem. Now the heading says your bike is a 1979 Sportster. Regardless of what it is, there is a crankcase breather that is routed to your air cleaner. This was done to satisfy the EPA regulation that crankcase fumes must be run through the engine to be burned. With the crankcase air come a mist of oil. This oil builds up in the air breather and runs out. You have to clean the air filter out periodically. You can find the crankcase breather hose and re-route it somewhere else so the oil won't go into the air filter.

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Now, the engine on your 93 model is what we call a case breather. The engine's crankcase breaker is located on the engine's cases down low. Later models are called "head breathers" in that the crankcase breathers are located in the rocker boxes, up high. So, even though the oil sumps on the later engine the oil doesn't go into the breather AS BADLY as the earlier models but it still gets in there.

Look on the back of the air breather assembly. There should be a pipe coming from the front of the engine on the timing gear cover on the right side of the engine going to the back of the air cleaner. Temporarily disconnect this pipe. Start the engine and allow it to run for a few minutes. Once the oil stops coming out of the pipe, reconnect it and disassemble the air cleaner. Clean the air cleaner. If the paper air filter is saturated, replace it. Reassemble the air cleaner assembly.

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