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9hp briggs and stratton engine has gasoline in the engine oil

9hp horizontal drive for electric generator. used for emergency electrical power only. therefore is not used except when required. started and checked out spring and fall.started it, excessive smoke! shut down. found gas in engine oil.could you please tell me what would cause this and the repair procedure. thank you

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Old gas, gone bad from sitting. Drain all gas out and use carb cleaner in unit to clean. Add fresh gas.

Posted on Oct 01, 2009

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Gasoline in mixed with oil in the crankcase also oil pouring out from the valve cover. Runs rough and smokes badly. What are the possible causes?

Gasoline in the oil is indication of fuel leaking past the needle and seat when the engine is not running (also high pressure in the fuel tank). You may be able to continue to use the generator with weak needle and seat (change oil) , however you must shut off the fuel when the engine is off. Easy fix however by installing carb kit. Find model number of the engine (stamped on fan cover) and contact small engine repair shop or look on line. Do not run the engine with gas in oil. Good luck.

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Just bought a generator 5000/6250 style but my husband can't pull the recoil handle. i think it's stuck so we can't test the generator. the unit was shipped from california to the philippines. pls advice...

Try removing the spark plug and rotating the engine by hand.
It could be just a little corroded from shipment over the ocean.
But once you have it loosened up and the oil circulated, it should start much easier.
Make sure it has oil in it, because sometimes they drain the oil before shipping.
You could also have someone else try the starter rope. A new engine can be hard to start.

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Your engine is a 4 cycle engine, if memory serves. You should not be mixing oil with the fuel. The crank case will hold around 750cc of engine oil, typically 30wt for warmer temperatures. Fuel should be gasoline with no more than 10% ethanol, no ethanol would be better.

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Engine is surging when in idle

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My propane generator engine has apark and gas

For a quick test.

Check engine oil.

Remove wire from low oil sensor and see if it starts every time.

If that works change oil and replace low oil sensor.

Hope this tip helps to solve your problem.


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