My Daymak 260 is stalling out on me. Runs great for 15-20 min then it dies. Carb has been removed several times and is clean. Plenty of fuel getting to the carb. Lots of spark, and power just stops. If I let it sit for five minutes and its good for another 15 - 20 min.

How do I test the float level to ensure proper amount of fuel is being kept in the bowl? Also I'm getting a loud misfire while starting.
Any thoughts?

Thanks

 

pop the carb back out. take off the float bowl. move the float with your fingers. look at the needle valve in its seat and see if it is moving freely up/down in the seat. if not, then take it apart and clean it with carb cleaner and a QTip and compressed air. also check to make sure the fuel tank is vented. either by hose or a vented fuel cap. that way the tank doesn't pull a vacuum and reach equilibrium and quits flowing to the carb. remember: high pressure flows to low pressure. without a pump, it is head pressure down to vacuum (carb).

 

I agree with jaster94.
It sounds like a vent problem to me.