2007-09-05 15:25:37 · 9 answers · asked by fxrnjustaskin 1 in Cars & Transportation ➔ Motorcycles
a backfire is caused when all the fuel is not ignited after the piston has compressed, and it then finishes exploding in the tail pipe. what would cause that is the car is running too rich, but it is known that as a car ages things like that happen and without a rebuild its gonna happen, its nothing big and its not a problem, it just scares the occasional pedrestrian:D.
2007-09-05 15:36:42 · answer #1 · answered by messerschmitt135 2 · 0⤊ 0⤋
1985 Gsxr750
2016-12-10 17:45:21 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Backfire on decelleration is caused by an overly lean fuel mix, not overly rich. You might try adjusting the idle screws to richen the mixture and see if that helps. Many bikes of that era had extremely lean idle mixes as set at the factory.
2007-09-06 05:51:07 · answer #3 · answered by bikinkawboy 7 · 1⤊ 0⤋
It could have many causes: Bad spark plugs; Incorrect fuel mixture; Valve clearance incorrect or valves not seating properly; Timing issues.
Start with the spark plugs (easiest thing to check), then the carbs, timing and last the valves (since they are most difficult).
Also the cam chain might be a culprit---loose or worn.
2007-09-05 15:56:33 · answer #4 · answered by Wyoming Rider 6 · 0⤊ 0⤋
Those symptoms are caused by a lean fuel mixture.
Check the diaphragms on top of the throttle slides for cracks or tares.
Check the intake manifolds for the same things.
The intake manifold o-rings may be leaking.
Tighten the intake manifold bolts and carb clamps.
2007-09-06 09:16:00 · answer #5 · answered by guardrailjim 7 · 0⤊ 0⤋
A friend of mine had this problem right after he changed his pipe. he changed it back to what was on it before and it went away.
the pipe he had put on didn't have enough back-pressure for the bike to burn fuel efficiently.
it could be your spark-plugs, fuel mixture or any number of other things, but this is what did it for my friend's R1. don't know if its your problem though.
2007-09-06 16:59:13 · answer #6 · answered by godz68impala 3 · 0⤊ 0⤋
an air fuel mixtire that is too lean is frequently the culprit for back firing. make sure your carb is recieving fuel as freely as it should. if you put on modifications such as exhaust, intake or a freer flowing air filter you may need to jet your carbs. you may also just need to clean and rebuild your carbs as your bike remembers the cold war years.
2007-09-06 08:39:44 · answer #7 · answered by will 2 · 0⤊ 0⤋
My guess would be a burn valve. Take a dollar bill and hold it to the exhaust pipe and see if it sucks it into the pipe while running idle. If so you probably found out what the problem is.
2007-09-05 18:34:54 · answer #8 · answered by edj009 3 · 0⤊ 1⤋
the mix is off
2007-09-05 21:29:13 · answer #9 · answered by forktail_devil 5 · 0⤊ 1⤋