Question about 2001 Harley Davidson FLSTF - FLSTFI Fat Boy

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Back fires through carb - 2001 Harley Davidson FLSTF - FLSTFI Fat Boy

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Cranks no start or fire add gas down throat of carbs and it back fires out pipes and carbs


bikes that sit for long periods of time need there points or electronics pick-ups serviced , rust and aluminum corrosion happens over time on these

miss fires are sure signs of this to mean out of time

and yes the carbs/tank will need a total cleaning out too

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Back firing can only be an ignition coil problem, replace the ignition unit.

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FC420V Kawasaki back fires thru carb on cold start,runs and starts fine after difficult startts


It sounds like your valves may need to be adjusted...
if they are too lose or worn they won't seat properly and when the engine fires it blows back through the intake valve.
pull the cover and see if the rockers are loose... it only takes one to give you a headache.

Mar 29, 2013 | John Deere 420,1020,2010,2020,2510,2520...

1 Answer

I have a 24hp briggs els have to prime carb with gas to start when cold


check the anti back fire valve on the bottom of the carb it might b e stuck partially closed

Apr 10, 2012 | Garden

1 Answer

Just bought a 1994 Shadow 1100.Bike was sitting for a while Got it running but wont idle,and Back fires .Would this be a carb.problem or something else?


Yes, it is a carb problem. The carbs need to be thoroughly cleaned. It won't idle because the slow speed circuit is gummed up. The back fire is a situation where one carb is driving another. The best carb is driving the engine and the worst carb is running rich. This imbalance causes the backfire.

Jun 27, 2011 | 1994 Honda VT 1100 C Shadow

1 Answer

Tractor is back firing , will start and idle but will not run under load.


back firing???? out the exhaust or the carb.
my first guess is the spark plug wires;(under load). any thing in the ignition system; plug too.
back fires out the exhaust under load sounds like low fuel... rebuild carb or star by cleaning the fuel filters.

Apr 29, 2011 | John Deere Garden

1 Answer

My 1986 F 350 with a 350 4 barrel carb back fires


check the vacume lines keep me posted

Sep 13, 2009 | 1986 Ford F 250

1 Answer

Four wheeler back fires


If the motor has two carbs then balance the carbs. Balancing the carbs basically means being certain the slides on both carbs open up simultaneously. If one carb opens sooner than the other then it 'drives' the other carb and can cause the backfire. Other things can can cause a backfire but lets start here first.

Mar 13, 2009 | 2003 Yamaha YZ 250

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