Question about 1985 Yamaha FJ 1100

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FJ1100 is running a little bit rough and fuel is leaking out of #2 carb fuel over flow hose

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It looks as if you'll need to rebuild your carbs. As for No. 2 cylinder it would appear the float is stuck down not shutting off the fuel supply. This may be a mechanical issue with the carb or simply some build up not allowing the valve to shut off completely. I'd pick-up a rebuild kit, remove the carbs, tear them down and clean them up.
I hope this may have helped
Tom
PS: Great bike!

Posted on Oct 02, 2009

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Posted on Jan 02, 2017

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Why is bike flooding and pushing gas out top over flow hose on carb after it runs for a min or two. Carb float been replaced still doing it.


Hi, Paige and the usual suspects are:
1. Damaged or restricted fuel tank venting system.
2. Loose float bowl screws.
3. Damaged float bowl o-ring.
4. improper fuel level in the float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
For more information about your issue please visit the websites below. Good luck and have nice a day.
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Motorcycle complete loss of power and bike dies


check that the tank cap is venting and not causing a vacuum in the tank and lack of fuel to the engine.

Jun 01, 2013 | Motorcycles

1 Answer

I have a 1999 chevy silverado 1500 2 wheel drive 5.3. It was running rough i took it to advance auto parts they put it on the machine it said idel control senser, throttle control senser, mass air flow...


Sounds like a vacuum leak. Spray carb/throttle body cleaner at all fuel and air intake areas ie; intake manifold to heads, throttle body to intake, all vacuum hoses, etc. Work the throttle to keep it running or have someone inside doing it. You will know if the carb cleaner gets sucked in somewhere. That will be the location of your vacuum leak.

Apr 01, 2017 | 1999 Chevrolet Silverado 1500

1 Answer

My 1981 Honda "CB750K" runs rough at low rpm and


1 and 2 run off different coils so its not electrical
do a compression test after checking all valve clearances
clean the carbs
check for any cracked hoses to the fuel tap,
and check for fuel tap operation, and its not running on prime, no fuel should flow in the run or reserve position until the engine is running.

Oct 27, 2011 | Motorcycles

1 Answer

Have a snapper mower.son put 2 cycle mixed fuel in it and ran it for about 5 minutes. Now wont start. Drained and replaced fuel and changed plug. What next?


the gas sitting in the carb is "still" 2-stroke...there's a bolt on the bottom of the carb...DON"T remove it, just loosen it til the gas leaks out (about 30 seconds or so)...that is letting the 2-stroke gas out and letting in the right gas...make sure the bolt is snug..NOT TIGHT...and giver a few pulls...no choking is needed since it's already flooded from pulling on it...it'll smoke a bit and run a little rough, until it burns the oil mix residue out of the muffler...Now get a Sharpie & mark the cans... 8^)

Jun 02, 2010 | Garden

1 Answer

GSF 600 SV 97 fuel problem


If the bike will run with the choke on then you have a lean fuel/air mixture condition. Most common cause is a vacuum leak or faulty pitcock. Spray some carb cleaner around the carb mounts with engine at idle, if the rpms change there is your leak.
Your petcock should have two hoses attached to it. One hose is the main flow to the carbs. The other hose is/should be a vacuum hose that allows the gas to flow (when vacuum is applied). When your petcock is in the PRI position, this will bypass the vacuum hose. Leaving it in PRI when motor off could possibly flood the engine. Check to see if that vacuum hose is attached properly with no splits or cracks near both joints. If all is attached properly your problem is the petcock itself. It has a diaphragm and 'return' spring. Weak return spring, clogged petcock, damaged diaphragm can all cause your problem. Also, after you recleaned and inspected the carbs, were they synched... if not, this needs to be done.
Good luck...i hope this helps..please rate me a fixya.

Sep 19, 2009 | 1997 Suzuki GSF 600 N Bandit

1 Answer

Gas leaking from hose that is under tank that is not for gas flow


is it an overflow from the carb? gas will only be in one of 2 tubes and they are the fuel line from the tank and the carb over flow. unless you have an electronic fuel pump then tubes go from tank to pump to carb. if its coming from the overflow then you are getting too much fuel into the carb float chamber. you may have a sticky float. thy getting some Berrymans B12 fuel additive and putting double the doseage in the tank. run engine til hot then leave it to stand overnight. this should break down any gum/varnish that has built up in the system

has this been in storage thru winter?

Apr 02, 2009 | 2001 Honda XR 250 R

1 Answer

My son just called to say he put diesel in the tank. He hasn't started it yet. Is there a drain on the fuel tank or does he have to siphon and then use rags to soak up the rest?


Hi and welcome to FixYa,

Initially, what could be suggested are:
  • remove the fuel hose end connected to the carb;
  • fit that freed end to a suitable container;
  • depending on the version, PRI setting of the fuel valve/control would make the fuel in the tank to flow;
  • if PRI is not available, the smaller hose leading to the carb/rubber coupling from the valve would have to have a vacuum to enable fuel flow;
  • alternately, the entire tank could be removed and inverted to remove the fuel inside;
  • there are drain screws at the very bottom of each carb to remove the fuel inside the bowl;
  • flushing the tank with gasoline would help after diesel removal;
  • if diesel was removed and replaced with appropriate gasoline, it is possible bike may run a little rough for a bit of time;
  • your suggestion of siphon will work, no need for the rag (though not a bad idea).
Good luck and Thank you for using FixYa. Happy Holidays.

Dec 14, 2008 | 2002 Suzuki GZ 250 Marauder

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