Air Filter Soaked in Gas - Kawasaki Ninja 250R Forum
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post #1 of 4 (permalink) Old 04-13-2014, 12:26 PM Thread Starter
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Air Filter Soaked in Gas

Disclaimer: I am by no means "mechanically inclined" and relatively new to motorcycle ownership.

That being said, I need your help. I took out the air filter to see if it needed to be cleaned or replaced but was not prepared for what I found.

The air filter smelled and appeared to be soaked with gas, which I presumed to be a pretty bad sign. I brought it in to rinse it out, but the more I rinsed and wrung it out, the more gas/oil/sludge oozed out.

Before I take her into the shop, any ideas as to what this means, or what underlying issues I could be dealing with?
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post #2 of 4 (permalink) Old 04-13-2014, 01:15 PM
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First you need to check your crankcase oil level to make sure it is not full of oil and gas. Too much oil in the crankcase can be forced in to the airbox thru the crankcase breather tube located on the bottom of the airbox.
If you do have gas in your oil, you probably have a problem either with your petcock or carb floats or both. They are allowing fuel to overflow the carbs. Neither of which is a good thing.

Second, you need to replace your oil filter and oil immediately.

Thirdly you need to replace your air filter. By the looks of it, it is highly compressed and dirty. Keep in mind the stock air filter is lightly oiled but not saturated. Kawasaki recommends replacement @2 years. A dirty and unserviceable air filter can lead to airflow problems leading to poor performance along with possible flooding of the carbs

Air Filters available for the 2008 & up Kawasaki Ninja 250R

Oil filters that will fit 2008+ Ninja 250R
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post #3 of 4 (permalink) Old 04-13-2014, 01:39 PM
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In a worse case scenario, you may have reversion.
Reversion is the flow of the air fuel mixture out of the cylinder and into back into the intake manifold. Reversion happens even on a stock engine because the piston is moving up the cylinder before the intake valve closes. This is usually a sign of a needed valve adjustment
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post #4 of 4 (permalink) Old 10-19-2017, 10:01 AM
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First guess would be valves and look at cold clearance on the intake valves. Might as well make the job easier and pull the fender liner, air box and carbs too. Well worth it to make sure the air box is clean.

On valve clearance, a little loose is noisy and slight power loss but too tight is really bad for valve life as they run hot. On outdoor power equipment, valve adjustmet too loose can make hard starting as it negates compression release but the EX250 doesn't have low speed compression release.
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