I have a omc 22hp in acushman mower,it run for 10 minutes then dies .i took the crank case breather hose off then it will run.what would be the problem

I had the same problem. Fuel wasn't there. Disconnect the fuel line from carb. Fuel should run good.

Check the breather in the filler cap. slaken it off when it starts to die, if it picks up again replace the cap.

see if the oil smells like gas the needle valve in the carb doesn't seat the carb over flows into the crank case washing down the oil

I have seen this problem a few times and this may not be the solution however, check the fuel filter. It may have melted and partially closed off the fuel supply. The routing of the fuel hose will cause the inlet end to bend slightly if it gets too hot under the hood.

Hi, they have had issues with the fuel shut off solenoids in the bottom of the carby not holding open which intermittantly starves the carb of gas. This would be the first thing I would have replaced, especially if the plug is dry but you still have spark when it stalls out. Regards Phil.

The tank breather is in the filler cap, just try slackening the cap when it starts to die, if it picks up again replace the cap.

Slacke off the fuel filler cap when it starts to die, if it picks up again the fuel tank breather is blocked.

Hi, Shawn_luke_I oil level readings are taken when the engine has reached normal operating temperature and the usual suspects are:
1. Overfilled oil tank dipstick reading should at or below full.
2. If the sight glass is full you are running to much oil.
3. Excessive blowby caused by worn out piston rings.
4. Piston rings never properly seated.
5. Faulty breather valve or system.
6. Pinched or clogged breather line/hose.
7. Clogged or failed oil filter.
8. Contaminated oil dirt-rust-water etc.
9. Excessive oil foaming.
10. Wrong oil type not designed for your bike.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a wonderful day.
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Oil out of breather tube on YZ250F
YAMAHA YZ450F Owner Service Manual
OEM parts for Yamaha
Yamaha YZ450F Owner Manual

keep it running and after it gets hot this oil should burn off,you might want to change spark plug though

The breather hose has nothing to do with it not starting. It starts when you prime the carb and dies when that gas is used up. Being a Tecumseh. it's most likely the bowl nut/jet stopped up. Unscrew the bowl nut and clean it. Look cery carefully at the top of the threads. There is probably a very small hole there also and it will not run if it is not open.