Question about 1985 Yamaha FZ 750 FT (U.S.)

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It sat for five years,when i got it started and reved engine sparks and fire came out of tail pipe

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One or more carb floats is probably stuck open. This causes unburned gas to get into the tailpipe. The sparks and fire are the result of the fuel igniting while inside the tailpipe.

Posted on Mar 16, 2011

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Posted on Jan 02, 2017

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1 Answer

What cause the engine to run rich and black smoke coming from tail pipe?


hmmm sounds like the fuel pump is more of the issue as its sending too much fuel into the motor making it run rich or the gas that your using is too rich for the motor itself

Apr 22, 2017 | Cars & Trucks

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Bike wont start. lots of spark, good fuel, but no fire, it does have very kow compresson an oill leaks out the tail pipe


Hi Rob:
Make , model, year, KM?
Sounds like you're about ready for a piston kit or ring and cylinder replacement.

Sep 09, 2015 | Motorcycles

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Left side cylinders 1234 run right side don't and tail pipe is cool left side is hot all injectors are working all spark plugs fire


It is IMPOSSIBLE to help you without knowing the MAKE, MODEL and YEAR of your vehicle, and which ENGINE it has.

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Car backfire smoke and spark came out tail pipe 2003 saturn ion


! Your injectors are floading the engine with too much gas. may be an injector stuck open, but not all of the fuel is burning in the engine and its running into the exhaust system, A hot catalytic converter ignites the excess fuel causing it to ignite and spark out your tail pipe. It can cause a huge fire. Dont drive it until its fixed.

Oct 21, 2013 | 2003 Saturn ION

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Car cranks but no start


no year or model, really?
ok ill answer for a Generic car (hopeless)
1: no spark and all EFI systems kill fueling at the detection of no spark (stopping the burning fire, and 911 call,etc.....)
i must stop, no year, wow.
if car is 1996, and newer my answer would be....
check all fuses in cab and engine bay for blown.
scan - all newer cars the scan tool is $9 (ask) or fleabay it your self.

spark , no engine option stated, must i guess it all? wow.
but each year, generation has newer spark designs.
totally radically different by GEN.
ok if its a 96"
the scan tools shows zero rpm cranking, and maybe code, 340 or 355, if yes, the Ckp is bad with zero rpm, in fact RPM IS CKP.
CKP means crank position sensor.
some engine, (lots) can die with a CMP dead.
CMP is the Cam angle sensors. (some, not all)
the FSM covers no spark , why not read it.
go to
alldata.com and see it all .
or post car spec, and we can post EXACT answers.
not possible now..

Sep 25, 2013 | Honda Cars & Trucks

2 Answers

Gas comming out of the tail pipe check engine light does not come on.


Chances are it is water coming out this is normal to notice some water dripping out of exhaust periodically as the car runs, If the liquid actually smells like gas i am at a lose I have never heard of this occuring.

Dec 06, 2009 | 2000 Mitsubishi Diamante

1 Answer

Blown head gasket or not?


check oil dip stick for water/antifreeze and radiator for oil in antifreeze but usually alot of white smoke-steam from tailpipe usually indicates head gasket blue smoke means oil black smoke carbon

Sep 29, 2009 | 1993 Acura Integra Hatchback

1 Answer

Bike only fires once


Okay, let's have a look at it. Say Ahaaa.
The probable cause of the problem is not the spark. Get a fresh set of Stock NGK spark plugs, ground the plus to the engine, and check each cylinder for spark as the starter button is pressed for 3 seconds or so. I will wager that the spark is present.

The likely problem is the fresh gas was put into a very rusty gas tank. Bits of rust now inhabit your carb and are having fun plugging up the carb. Look at the gas valve. With a little luck there is a small bowl behind the valve. Remove it and tell me what you see in the bowl.

Apr 11, 2009 | 1982 Yamaha XS 400 SE

1 Answer

No power


your catalytic converter could be plugged up. try reving engine in neutral and if it sounds labored or slow then this could be your problem and have the exhaust checked. If exhaust cant escape out of your tail pipe then you cant accelerate quickly or at all.

Jan 12, 2009 | 1986 Plymouth Caravelle

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