I JUST DID VALVE SHIMS AND A NEW CARB I HAVE TWO OF THESE SCOOTERS AND THE OTHER I JUST CLEANED THE CARB AS SOMBODY PUT SUGUR IN THE TANK FOR ME. IM A CERTIFIED MASTER TECH IN AUTOMOTIVE AND THESE SCOOTERS JUST THROW ME FOR A LOOP FOR SOME REASON
SOURCE: how is the fuel being deliver from the tank to
runs a vaccuum operated tap which only allows fuel to flow when engine running
SOURCE: have a honda crf100f 4cycle got spark wont start,
CLEAN THE CARB AGAIN IF IT RUNS ON STARTING FLUID ITS NOT GETTING FUEL YOU WILL NEED TO REMOVE THE JETS AND MAKE SURE THEY ARE CLEAR
SOURCE: Wont start. Turns over
had simular problem with my sl50qt-7 - qmb139 engine - was bad fuel pit **** pump at fuel tank - replaced it and filter and that took care of my problem.
SOURCE: have a 15.5 hp craftsman
I feel after reading the symptoms that the valves may need adjusting. Is this a Briggs OHV motor. The valve train is sensitive on these and requires periodic (once a year) adjusting. It is not very difficult. A sticking valve or an ignition timing problem could be the cause of the backfiring. Some good, stong fuel system cleaner (like Berryman B-12 Chem Tool )in a heavy dose mixed with the gas you use can readily clean gum and varnish off a sticking valve. The timing problem is a bit tougher nut to crack. If the flywheel key has sheared and the flywheel has moved even slightly on the crankshaft, timing will be affected (with the symptoms you describe). The intake valve not closing all the way can cause this too. To check the valves, remove the bolts holding the OHV cover on the front of the engine. Don't worry, lots of oil won't pour out. It is stored at the other end of the motor. Pull the plug out and rotate the engine by hand. You will see the valve train in motion and be able to readily tell if the valves are seating. If adjusting the valves doesn't fix this, then you will have to remove the engine cover and examine the area of the crank where the flywheel rests. It is slotted and lines up with the slot on the crank. A metal key helps hold the flywheel in place initially (the crank is tapered there and would hold it anyway)....but the key prevents the engine from trying to continue to run if the mower blades strike an immovable object. Instead of the crank breaking, the metal key does. Post back if needed. I am here to help.
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