Question about 1974 Yamaha XS 650 A

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Rear clyner runs rich and backs fires

The cleyner runs rich and back fires and cuts in and out is it timeing or fuel thanks

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Check valves and clean carbs

Posted on Nov 26, 2008

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2 Answers

I have 1996 isuzu rodeo , drives. looses power, dies and back fires like a shot gun,


back first to tail pipe end, not air cleaner, right.

back fire to tail
is caused by 2 reaons.
engine runs rich as a pig, and air leaks to the exhuaust.
fuel + air and flame + bam.

sounds to me you lost cam timing
i cant help you more , as you never stated what engine is in the car.
called ENGINE OPTIONS< day 1.

and the story is lacking
start backup and .does....... what/???? runs prefectly???? or ????

Aug 25, 2014 | 1996 Isuzu Rodeo

1 Answer

Fuel system running rich and stalling


Sounds like it is slightly out of time.

Apr 14, 2014 | Ford Cars & Trucks

1 Answer

Fuel system running rich


Sounds more like it's running lean. Have you checked fuel pressure at the rail? Could be the filter. Also try pulling the vacuum line off the regulator to see if the diaphragm is split and leaking fuel into the manifold.

Mar 05, 2017 | 1995 Ford Escort

1 Answer

My Liana got a problem of Back fire I changed ignition coil first then i Change their complete head but problem remain same?


Back fire back to where, the intake or exhaust.
intake backfire is a pop sound, not too loud, and is bad timing.
exh backfire means, fuel plus air is in the exh.
and explodes with a loud report , we call it muffler explosing to help
with clear meaning.... in this latter example
you have a bad running motor (rich as pig) a dead CAT and exhuast air leak
all at the same time.

Mar 29, 2013 | 2006 Suzuki Liana 1.3

1 Answer

05 acura tl had both heads replaced and the rear bank is running very rich


since you have a cherry red catalyst surely you have a clogged cat and if you do emission test surely is going to indicate the catalyst. now if the one of the cylinder heads is running rich just confirm whether you have any injector with a malfunction and instead spraying the fuel is pouring the fuel and cause fuel to go through exhaust not burnt and possible that is the reason which damaged the cat.

Sep 01, 2012 | 2005 Acura TL

1 Answer

Rough idle and back firing at idle speed


Sounds like it is running rich, and needs timing checked. I would check the fuel pressure regulator, and the fuel lines leading up to it. If you are throwing an engine code check that out as well. Let me know. THanks.

Mar 09, 2011 | 1995 Chevrolet Blazer

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1985 Yamaha Virago XV1000 flooding issue


sound like your float valve is sticking carb cleaning time

Jun 23, 2009 | 1988 Yamaha XV 535 Virago DX

1 Answer

Back firing & cutting out


If a stock intruder is running rich it must have a restriction in the air filter or a problem with the carbs. These bike are always way too lean from the factory. Check to make sure the filters are not plugged up. Also if it is truly rich it will start and run well without the choke on. You may have inricheners that need adjusted.

Feb 26, 2009 | 1996 Suzuki VS 1400 Intruder

1 Answer

Back firing


what do you mean stupid? 87 89 90whatever unless you got some serious mods you shouldn't really notice that much difference in the performance between redily available octanes in pump gas. more likely a coincedence. timing; rich fuel mix; jets in carbs among other things can cause back firing. run the tank off or drain into yer mower and put in summpin else if it gets right again blame it on the gas if not the GAS didn't break it somthin else just got screwy good luck bro

Apr 22, 2008 | Harley Davidson Harley-Davidson Motorcycle...

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