Older bs 3.5 hp 20 in cut walk be hind mower hunts and or surges while running started between refilling tank is it poor gass wrong gas useing 87 octane new oil wtf is happaning
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Surging (governor hunting) at idle is usually a fouled carburetor.
Does it not surge when engine is operated at high speed?
If it is governor hunting at both at high and low speed, then either it has a vacuum leak (unlikely) or contaminated fuel especially when fuel has ethanol. Suggest you drain the fuel from tank(s)and the carburetor fuel bowl. Then try a couple gallons of fresh fuel from a station. Don't use what you may have on hand as it too may be contaminated.
If it only hunts at low speed then less likely it is a fuel problem and the carb low speed circuit has a blockage and will need cleaning.
There is also the possibility of a fault in the safety circuit that kills the engine when PTO enabled but with the governor hunting it's likely a carburetor issue.
sounds like the gas is bad, drain tank, refill will known good gas. You may want to put a fuel cleaner in with the gas, if you let equipment sit around for awhile with gas in it it will tarnish and draw moisture. Hope this helps Tim
You should check the vacu jet carb on this mower for either a vacuum leak where it mounts to the gas tank, a blocked or split intake tube in the the gas tank or a weak/worn out diaphragm.
You can spray a little carb cleaner at the base of the carb while its hunting and see if it smooths out. If it does you have a warp between the carb and tank. Either the tank is bowed or the carb *(nowadays made of plastic) is not flat anymore.
You can either buy a new carb or gently sand the warped one a little and see if that works.
Be sure to take pictures of your carb setup before removing it so you can reassemble later.
Pour vinigar and hot pepper sparkles into the gas tank and mix it with the gas. Then start it- the differance in the way it runs will be very noticable!
Hunting & surging usually is the carb. main fuel jet is dirty, restricted fuel passage, or the governor. Try running some Seafoam carb cleaner through the gas tank first and see if it helps, and don't use ethanol-blended fuel. It absorbs moisture.
On some mowers...if the gas cap vent is not working properly, it will run fine for about 15 or 20 minutes, start spitting and sputtering, if you loosen the cap, and let air back into the tank it starts running normally again.
Carb. float must be stuck open. First if you have no fuel in the tank it must all be in the crankcase.Drain the oil and refill and also check the carb as the float has to be sticking open. Hope this will help you. Donnyb60
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