Wont start power mate 5500 wont turn over. checked the oil levels and thats fine. put in a new spark plug. seems to be getting gas. no problem. still wont turn over.

replace the low oil level sensor pack
it controls spark

Hi Anonymouse:
I'd be checking to make sure that the correct fluid in the correct amount was added to the correct place.
Start with the oil. Check the dipstick or indicator level. Too much oil will stop the engine. Sometimes gas get accidently put in the oil filler if an inexperienced person is helping with the maintenance.
Gas.......... Make sure that oil was not accidently added to the gas tank. Drain the carb and put fresh gas in the gas tank.
Spark plug.;.... pull and check for fouling. Replace if not really clean. Check for hot blue spark before re-installing.
This should get you back digging up the garden very soon.

If this engine turns over then try this. I am not sure if you mean starter won't turn or just won't start when turning over.
Take the fuel bowl off and clean it real good as well check the fuel jet and make sure it's not plugged. The jet in most engines is in the bolt you take off the bowl with. There should be fine holes in the bolt itself. I use my air compressor to clean mine.
If you want to try something first take the spark plug out and put a table spoon of gas in the spark plug hole and put the plug and wire back on. Try to start and if it fires up then stalls then you know its carb related.
Also if you have a fuel adjusting screw in the carb you can turn it out a little at a time to set the gas flow to the engine. Do this first before you take things apart.

Our motorhome Onan 5000 Marquis generator will turn over and try to start but fails everytime we test. We have primed, gas and oil are fine and we have new spark plugs. We also changed the gas filter on the generator. Any suggestion? Thanks, Loretta

check the oil level. there is a low oil cut off.

Your engine is flooding due to the carburetor float and needle having a problem. Do not try to run you mower like this. The fuel gets in the oil, where it acts like a thinner removing oil from critical surfaces. Remove the carburetor, disassemble, inspect and correct the problem with the float and needle. Change the oil, put fuel in tank and monitor level, remove the spark plug, check fuel tank level, turn engine over several times to get fresh oil in place, reinstall spark plug, check fuel tank level (ensure stable level), if all is good, try starting.

I hope this helps.

flood it out means that there is too much unburnt gas in the cylinder. the spark plug is probably wet with gas. simple fix though. just pull the spark plug out, pull the cord on the engine a few times and let everything set untill the gas evaporates. then put the plug back in and try to start it. easy with the choke or it will happen again.

Check for low oil level. If level is OK, check low oil level sensor. Disconnect the wire to test.

If you could not start in spite of oil and gas change, checked gas supply, spark plug, ignition cables and coils (magnetos) and so on whitout success, then try this:
Your generator has a low oil level protection, which stops the ignition of the motor.
After "a couple of years" sitting without or with old oil, the level switch may have got lazy or stuck down.
If your oil level seems to be good, while measured, find the oil switch and try to shorten or disconnect it.
If you succeed in running the generator change or repair the oil switch.

I hope that this will be helpful, because I don't have your device in front of me, but some people rank such an answer with 2 thumbs, which means useless. Better dont rank.

With your model number I could see if it has a low oil safety switch I have seen them go bad (check your oil level )
With all wires un plugged from the coil you should have spark
if not coil is bad .
Use another spark plug to test for spark, ground the side of the plug by holding it against some-ting metal on the engine , spark
plug wire hooked to the plug. leave a spark plug in the cylinder
head so gas wont fly out and hit the test spark plug catching fire (seen it done).
Good luck