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Anonymous Posted on Jul 02, 2014

Why is the it back-fire, bucking, mis-firering, stalling? 2008 GV650. High Octane gas.after 5 to 10 miles driving I smell gas, back-firers, stalls at lights,drains battery, have to run with choke full

New starter solenoid installed a couple of weeks ago, 93 octane used. It runs so ruff or stalls.

1 Answer

Red River RV Repair

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  • Expert 405 Answers
  • Posted on Jul 02, 2014
Red River RV Repair
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You could also have weak coil pack(s). Weak fire will cause misfire, backfire and bad idle.

  • Robert Crowe
    Robert Crowe Jul 02, 2014

    Thank you Robert Roper

  • Red River RV Repair Jul 02, 2014

    You are welcome, let me know if this fixes the problem.

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5 Related Answers

Anonymous

  • 4565 Answers
  • Posted on Jul 15, 2011

SOURCE: My 2000 Harley Davidson Dyna Wide Glide will not

Your problem is far more serious than something a little Sea Foam will fix. I would guess that your slow speed jet is clogged up or you have a major vacuum leak somewhere. Look for the vacuum hose that plugs onto the backside of the carb and see if it's come loose. But, if your bike is equipped with the vacuum operated petcock and it's evidently working, this is probably not the problem. You could have vacuum leaks at the intake to head junction as well. If the bike was allowed to sit up for an extended period of time, the gasoline left in the float bowl evaporated and left behind the "varnish" that has plugged up the jets. The carb needs to be completely disassembled and all the small passageways cleaned out by soaking it in a commercial carburetor cleaner.

Good Luck
Steve

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Anonymous

  • 2336 Answers
  • Posted on Nov 10, 2008

SOURCE: fuel octane use

I use 87 just like the designers of the bike call for. pros=you'll go faster due to a lighter wallet cons=your bike may blow up

heimlich

David Belcher

  • 1978 Answers
  • Posted on Aug 31, 2010

SOURCE: My 1982 Honda v45 will

The slow jets and adjoining passageways are still dirty. As painful as it may be , take the carbs off and clean the slow circuit again or it will never idle. Double check the fuel pump is working properly and the fuel filter is not plugged. One time it took me four cleanings to get all four carbs working on a Suzuki that sat for five years. Also make sure none of the carburetor boots have developed rips from age.

heimlich

David Belcher

  • 1978 Answers
  • Posted on Sep 06, 2010

SOURCE: 1981 Honda GL 500. Used to be able to jump start.

Replace your main fuse on the starter solenoid. That should restore power. If you are having to jump the starter at the solenoid you may need a new solenoid. Your starter button could be the issue, in that case you would have to replace the switch assembly. As for running only on high revs, you need to take your carburetors apart and clean the idle circuit (jets an body passageways) These machines are notorious for burning out there spark plug caps. The caps unscrew from the end of the wires and should OHM out at 5000. If they read higher or lower replace them.

Anonymous

  • 8909 Answers
  • Posted on Feb 28, 2011

SOURCE: Lost of power on throttle increase and motor dies

I would say you have a blocked or damaged jet. I would strip down the carburettor and replace any badly worn jets and clean thoroughly. When refitting the tick over mixture screw , screw it home and back out about 2 1/2 turns. That will be somewhere near it.
Hope that helps.

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Why after 5 to 15 miles back-fire, stalling, mis-fire, full choke to keep running?When stopped I smell gas and battery is drained. Does anyone know what may be going on?

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Could be another problem. It`s just a coinicidince that the car started stalling. You could by gas at any gas station for this car. It could be cheap gas from a no name station, and the octane level would`t matter. I would be more concerned if he was driving a high end car like Jaguar, Mercedes, Porshe. etc.etc. -where you need a cetain level of octane. Have your son`s car checked by your service shop to narrow down the stalling problem..
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Backfiring after warming up can be from many things.

One that comes to mind is carbon deposits on valves, causing them to not close properly. The carbon deposits would also heat up and then ignite air/fuel mixtures before the spark plug can fire.
Or you would have hot exhaust gasses leaking back into the cylinder on intake and that would ignite the fuel.

Tac gauge fluctuating, and engine running rough on acceleration could be a vacuum leak, do you hear a hissing sound when the engine is running? listen closely under the hood. If you have a vacuum leak you would lose power and your RPM would fluctuate oddly. As for the backfire however, there are probably more than just one problem. Its hard to say for sure.

So please, more details, noises you hear, when exactly everything happens etc.
What speed and RPM the engine begins to bog down at, does it stall? What range is ur tac fluctuating at? anything you can think of, throw it on there.

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