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Pull plug hook it to wire and test for spark...place against bare metal and turn motor over,look at plug if u see spark ?? your good there if not try new plug could just be fouled., Then work your way through fuel system....
Take fuel cap off to make sure it is getting air to fuel tank. Check fuel valve to make sure it is on. Drain carb with screw on bottom of carb to check for water. Pull spark plug to make sure it is firing.
is it running out of gas? backfire is caused by a lean condition. I'd check the fuel path from the tank to the carb and clean the carbs. could have something floating around in there occasionally blocking fuel flow.
Hello Anon..
First, I would check to make sure the carbs are getting fuel, and then fuel getting into the cylinders. Your question about low oil - did you let it get low and then it quit? ...
If you put oil into the cylinders and only got 100psi, this might be your problem. You should be pumping around 120+psi without putting anything into the cylinders... Recheck the compression.= .take out all spark plugs...screw the gauge in until the o-ring seats, hold the throttle wide open while spinning the engine over for about 5 seconds... you should get 120psi +/- 10psi.
If you are getting less than 100psi.. it might be time for a rebuild..
mine did the same thing & then it finaly quit running altogether...the gas gauge stoped showing in the display also. I pulled the old fuel pump out & replaced it with one out of a 97 ford areostar witch has an almost indentical pump & now the machine runs like new...and my gas gauge started showing again & I saved myself 500 bucks because the pump i used was gave to me...lol
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