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Xs1100 1979 backfires runs eradict only on choke

Bike runs rich and cant get to idle

Posted by Anonymous on

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6ya6ya
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Posted on Jan 02, 2017

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  • 2336 Answers

SOURCE: bike backfire

Yes, it could (and probably is) be an air leak. Check to be sure the carb is tight in the intake manifold, and make sure the hot-start isn't loose and is sealing properly. Also make sure all of the exhaust system joints are tight, an air leak in the exhaust will make a four-stroke pop and backfire like an old work truck with no muffler...

Posted on Nov 10, 2008

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  • 2336 Answers

SOURCE: backfire

Yes, it could (and probably is) be an air leak. Check to be sure the carb is tight in the intake manifold, and make sure the hot-start isn't loose and is sealing properly. Also make sure all of the exhaust system joints are tight, an air leak in the exhaust will make a four-stroke pop and backfire like an old work truck with no muffler...

Posted on Nov 10, 2008

  • 2336 Answers

SOURCE: backfire

Yes, it could (and probably is) be an air leak. Check to be sure the carb is tight in the intake manifold, and make sure the hot-start isn't loose and is sealing properly. Also make sure all of the exhaust system joints are tight, an air leak in the exhaust will make a four-stroke pop and backfire like an old work truck with no muffler...

Posted on Nov 10, 2008

  • 7 Answers

SOURCE: backfire

Anna14 is right with the air leak,this can also be a misadjusted or faulty throttle position sensor or defective CDI Unit or a lean feul mixture.

Posted on Jan 22, 2009

  • 15 Answers

SOURCE: Yamaha V-Star 1100 backfires and will not run without choke on

Here are two solutions for you:
A - Take the carberator off and soak it in some good quality carb cleaner for about 1/2 an hour.  That should take care of any residue in the carbs.
B - Alternatively (and for the less technical minded) there is a great product called Sea Foam.  Try to find it at your local CSK auto/NAPA/Wal-Mart.  Pour a small amount (maybe 1/4 ounce) into each cylinder chamber (take out the spark plugs), try to pour a small amount into the carbs (a turkey baster works great for this), and pour the rest into the gas tank.  Let it sit for 5-10 minutes, then start it up.  *NOTE - the bike will start VERY hard at first until it burns through what's in the cylinders.  ALSO the fumes will be EXTREMELY strong and suffocating - make sure you do this OUTDOORS preferably, or at least in a VERY well ventilated area.
Good luck - I know how frustrating these things can be! :)
P.S. - I am a proud owner of a V-Star 1300 - great bikes! :)

Posted on May 26, 2009

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1 Answer

Backfires when choke is on, but almost dies without it when idling


I would check the jetting to be safe but it could also be dirt in the carb. The main jet has very little to do with lower engine speeds and especially idle. That is controlled more by the pilot jet and circuit. Your best clue is how it responds when you add more choke. If it gets worse then there is a rich condition but if it gets better then you have a lean condition. From what you have described it sounds like a lean condition.

Mar 07, 2012 | 2004 Honda VTX 1300

1 Answer

When take choke off stalls xs1100 1979


Hi, Anonymous and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Vacuum line from the petcock to intake manifold cracked.
5. Float needle and seat sticking.
6. Float level too low.
7. Carburetor bowl vent line clogged/blocked/pinched.
8. Idle adjusting screw set too low.
9. Air/fuel mixture screw set too lean.
10. Idle port, transfer ports, slow air jet clogged.
11. Slow fuel jet clogged.
12. Faulty fuel pump.
For more information about your issue and valuable "Free" downloads that you will need please Click on the blue links below. Good luck and have a wonderful day.
http://www.xs11.com/forum/showthread.php?t=39523
Bike starts up idles on choke dies with choke off our when warm
Yamaha XS1100SH Service Manual
OEM parts for Yamaha
Yamaha 1979 XS1100E Owner Manual

Feb 16, 2012 | Yamaha Motorcycles

1 Answer

My 05 crf 450r will not idle when I turn off the choke it also is backfiring and poping when I give it gas . Could it have something to do with the hot start cable ?


Check your pilot jet is not blocked or try adjusting your idle screw for the idle issue and it sounds like its runing lean which can also make it idle low and rough and will cause it to pop and backfire. Dont think it has anything to do with your hot start cable that will make it run it run better if its running rich but your is doing the opposite

Dec 28, 2010 | 2005 Honda CRF 450 R

1 Answer

Idles ok with choke out but wont run any higher


the carbereter jets are blocked up,, strip it out and clean them out
but dont go pokeing a bit of wire into any jets or you will distroy them
if jets are blocked the bike will normaly only run with full choke on

Feb 21, 2010 | 2000 Harley Davidson XL 1200 C Sportster...

1 Answer

Last time I STARTED MY VSTAR 1100 I CHOKED IT FOR 10 SECONDS ON HIGH THEN MOVED TO MEDIUM CHOKE FOR 4 THEN TOOK OFF AT NO CHOKE. 2 WEEKS LATER. I started up bike Choke on high bike barely wanted to idle...


Sounds like your flooding it out with the choke out. Try the next time you go to start the bike when it's cold with the choke out and when it starts push the choke all the way in and keep it running with the throtle. If it runs better after doing this then your flooding it on start up. Use 1/2 choke to start cold and see what it does. Good Luck

Sep 29, 2009 | 2001 Yamaha V Star Classic

1 Answer

Bike backfires and at an idle it shoots out a blue flame


Purchase a EFI controller. I suggest a Fi2000R. It is easy to hook up and fairly easy to set by the instructions.

Aug 15, 2009 | 2004 Yamaha FJR 1300

1 Answer

Will not start.


it sounds to me like you have altered the carb balance and not the idle as you tought,you cant adjust idle with the choke operating even just a bit as this changes which circuit you are adjusting in the carbs,unless you have a set of carb balancers available you will have to take the bike to a shop to get the carbs reset to standard

May 21, 2009 | 1998 Suzuki GSF 1200 Bandit S

1 Answer

Carb is acting weird cant seem to adjust


That is the choke adjustment,have you checked your timing on the motor and check and see if the vacum pod on the distributer is working. also check your vacum lines for any tears or cracks in them.

Mar 29, 2009 | 1984 Ford F 150

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