I have a coleman powermate 10hp generator with a Subaru OHV/OHC gas engine. The engine will not start unless I remove the (newly installed) spark plug and re-install it. It then will come one for a moment and then shut off. It was sitting for more than a year. I already siphoned the gas and added new.

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Coleman power generators starter not cranking related questions and answers. Ask your ... Ad. Question about Powermate Powermate 5000W Generator.

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Question Product: Coleman Powermate Powermate 5000W Generator Question ... it would crank for a second, then i open the choke, it would die, would not stay ...

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well im starting to cycle though my equipment before winter so more cold ... How To Change Oil On Coleman Powermate Generator / Yearly ...

Hi Jim, sae 30 mineral oil for all Briggs engines. Regards Phil.

Hi, It uses an NGK: BPR5ES

Kelly

Your small engines require ordinary 10W30 motor oil.

Don't turn machine on its side or upside down to drain oil, or oil will run into carburetor.
Use a plastic hose to remove old oil

You probably overlooked the drain plug, it is usually located on the mounting base of the engine. BUT, there have been some engines (old cheap ones) that the oil was drained by tipping the engine and draining out the oil fill. I am almost positive yours is not one of these.

Your manual is here, but that is only an "insert". It does look like the drain plug is located on the base of the engine. Find the spark plug, and the drain plug is almost directly underneath it at the very bottom of the engine.

More information is available from Subaru's website, including owners manual and especially a service and parts manuals. Your drain plug is item #13 on page 2 of the owners manual located here:
http://www.robinamerica.com/pmanuals.aspx?pid=80

take out the jets , and run small wire through all holes .should fix your problem

20:1 that's 1/4 pint to a full tank of fuel.

ACCORDING TO POWERMATE, THIS GENERATOR IS EQUIPPED WITH A 10HP SUBARU ENGINE. WHAT MODEL IS YOURS? AND R U SURE IT'S A B&G ENGINE?

check the fuel mixture settings i believe main screw is 1 3/4 turns from closed and the idle screw is set at 1 1/4 turns from closed. These settings are for non OHV models. also check that if you have a fuel filter installed that it is not plugged up.

You need a quart of regular old SAE 5W30 motor oil with detergent.
The engines on these generators are more or less the same as a lawn mower.
Don't forget to service/change the air cleaner when you change the oil, that should keep your generator producing full power.

Regards,
Carl