Question about 2004 kawasaki ZRX 1200 R

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Bike was running great then it started to studdering.brought it home looked at then noticed that the air box was full of gas and oil. why?

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tombones

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Some compression from the engine is getting past the rings and into the gearbox. With the compression comes some unburned fuel. The fuel mixes with the gearbox oil and increases the oil level in the gearbox. Now the "oil-gas" level is very close to the vent hose on the top of the gearbox. Remember that compression going into the gearbox? It now carries bits of oil-gas into the vent hose. Where does the vent hose vent to? The air box. The "low cost-getting by" remedy is to do an oil change, clean the air box, install a clean air filter and then do more frequent oil changes in the future. The proper fix is to do an expensive top end job on the engine. Please rate my answer. Thanks.

Posted on Jun 03, 2011

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