Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Check the oil. Does it smell like fuel. It sounds like you have a leaking/blown head gasket or the carb is allowing fuel to leak into cylinder due to faulty needle valve in carb. Do you have oil on the machine anywhere in the front. What is the compression currently?
Fuel has bypassed the needle in the carb and went into the crankcase. You will need to do an oil change and also clean carb and a rebuild would be best just incase the needle is bad instead of just stuck. possibly need a new spark plug also. Fuel/Oil leaking from exhaust due the viscosity is much thinner now since there is fuel present in the oil. Can cause major damage if ran too long as your oil is now thinned very much
how is the oil level reading? Does it look thinner than normal?
That is the problem then. Its not a hard repair, more aggravating than anything. Fuel shut valve is a great idea when used anyways huh? Change oil and you could be fine with only doing this as needle seats itself at times, but its a risk to gamble on. I would pull carb and go ahead do the cleaning and rebuild as those carb kits are not too much and you will not have to deal with this issue again
Fuel is thin and seeps. Needle doesn't seal the carb off, so fuel keeps flowing, it seeps into the cylinder, and then down into the crankcase through the piston. You don't have the compression you used to because the viscosity of the oil is thinner due to the gas. once the crankcase is full, the fuel/oil mix just wants out so it goes to the muffler next to escape
the rings are just sliding in the cylinder and there is nothing to slow piston down since the oil is so thin currently. Hopefully there is no damage to the piston/cylinder. It is possible, but most of the time no damage is done. Really depends on how long machine has been ran like this
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You should be fine then. Was it parked in a hot area. Fuel pressure from heat can cause the needle to leak as when the fuel system gets too much pressure build up, it leaks. You should be fine and be back to operations in no time
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