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Barry, Theres a good chance gas is entering the cylinders (if theres a lot that is) cuz its overflowing the carbs bowl. I see some potential good news n some bad news here: First, just because the gas was supposedly "shut off" at a tank or sediment bowl or a 3 way valve etc., DOES NOT MEAN its really shutting off gas flow due to that particular valves failure which can easily happen. The way to tell for sure if its actually shutting the gas off is to disconnect the line at the carb and with it shut off see if gas continues to flow, or even easier, just open the carb bowls lower drain cock/plug, shut it off, and see if gas still trickles out the drain. A leaky valve might??? be cured by disassembly and clean out any dirt sediment or crud which is preventign full closure, dependign on if its a sediment bowl valve or a 3 way etc. NOW WHAT MAY BE BAD NEWS If the carbs float n needle n seat assembly are all doing their jobs, gas shouldnt over flow the carbs bowl and fill the cylinders EVEN IF THE SHUT OFF FAILED OR THERE WAS NONE AT ALL. For gas to overflow the carbs bowl and flood over into the cylinders badly, the shut off must not work PLUS the float or needle n seat arent working. To see if the Float n Needle n Seat are working: A) With the gas on, remove the carbs air inlet pipe and look in the carbs throat and see if gas rises and runs into the throat; or B) You could remove the carbs bottom nut (be careful),,,,, ,,,, then carefully lower the bowl,,,,, ,,,,, , plug the hole,,,,, ,,,then see if gas enters n fills the bowl BUT DOES NOT KEEP RISING AND OVERFLOW IT; or, C) Remove the bowls bottom drain cock/plug,,,,, ,, install a hose barb on it,,,,, ,,install a clear plastic line rising up above the bowl level,,,,, ,,,turn her on and observe at what level gas rises and IF IT STOPS N STAYS THERE IN THE EVENT THE FLOAT AND/OR NEEDLE N SEAT ARE NOT SHUTTIMG THE GAS OFF AT THE PROPER LEVEL the float may be a leaker,,,,, ,,or the needle n seat are clogged or sticking or leaking. A) I would first remove the carbs side inlet strainer top nut n cap (you may need a new gasket)and use carb cleaner etc to see if you can clean that reservoir area out ESPECIALLY AT THE BOTTOM where the needle n seat are located. B) If she still overflows the carbs bowl n enters the cylinders, remove the Carbs bowl (dont loose the bottom center spring), insure the float rises n falls freely as it should, remove n inspect the float to see if it leaks. If it makes any sloshing sounds, its leaked gas inside it and sinks and cant raise to shut the needle off into the seat. If you immerse it in water and heat the water and bubbles rise, its a leaker. C) If the float is good n rises n falls but she still overflows the carb, the needle n seat must be bad or stuck or full of dirt or crud (it dont take much) and isnt shutting off the gas. Other possible causes if its none of the above could be a clogged bowl vent or even the casting has developed a leak and gas is flowing past the neelde n seat shut off. YES DEFINITELY CHANGE THE OIL N FILTER Theres more but I gotta run so I will cheCK BACK LATER. Post back or e mail your findings and any more questions and we will try n help you more. Hopefully others may offer other ideas or opinions on the problem. Good Luck n God Bless John T Nordhoff in Indiana [email protected]
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