Question about Yamaha Motorcycles

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When take choke off stalls xs1100 1979

Bike runs rich and cant get to idle

Posted by Anonymous on

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  • Yamaha Master
  • 41,824 Answers

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

Posted on May 04, 2017

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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HDTV GURU
  • 261 Answers

SOURCE: motor bike wont rev above idle weth choke on

This to me sounds like you need a carb cleaning. If you have let the bike sit for an extended time the carberators maybe clogged or gummed up. This has to do with the new gas that is out there now. It is cheap and with the introduction of Ethanol alcohol now it is even worse on being stable for long periods of time. I have seen fuel go bad in as little as 3 weeks.. One quick check you can do is open you fuel tank and smell the fuel. IF it smells like varnish it is probably bad. You can drain the tank and add new fuel and that should solve your problem. Keep in mind, that the carbs need to be drained as well to get the old fuel out of there also. Make sure you have a battery charger going when you start crankin that puppy, because you will need lots of extra juice to get that baby to fire up. If it is starting now and runs on choke, that means your idle jets are clogged. Best repair is to remove carbs and clean idle jet. Unless it is fuel injected.
Let me know how that goes and we can proceed from this point. I am a certified mechanic from MMI as well as a HDTV GURU. Smiles. have a good one.

Posted on Dec 07, 2008

robotek
  • 1512 Answers

SOURCE: yzf 250 wont run without the choke

Hi mikelapt
You will have a carby problem. When the choke is one, and different fuel circuit is used. When you turn off the choke, you go back to the idle circuit of the carb is used, when under throttle, main jets kick in. You probably have a blockage in one of these circuits. Strip the carb down, clean with carby cleaner, blow out all air circuits and jets with compressed air, then setup the idle mixture and tick over speed. Always work with fresh fuel, and drain off, discard any fuel older than a couple of months. It goes off, and turns to a gel  like substance that blocks up your carby. Hope this has explained your problem. Happy to talk to you more about it. A FixYa vote is a great reward for for my time taken to explain this to you. Cheers
regards robotek

Posted on Feb 08, 2009

  • 2 Answers

SOURCE: yzf 250 wont run without the choke

Your low speed jet is pluged. You will have to remove the carb then remove the screw in the float bowl. You will see a main jet and a pilot jet. You will have to remove the brass plug that covers the air ajust screw. Then turn it in to find out how many turn till it bottom out. Then remove the screw and take carb cleaner and blow out all passages.Then reinstall all jets. Hope this helps.

Posted on Feb 16, 2009

freetek
  • 5568 Answers

SOURCE: bike wont run when choke is at half way setting

Sounds a lot like fouled fuel jets in your carb; you may have a little work to do.
If the jets do not allow sufficient fuel to pass, using the choke can 'cheat' the carburetor by restricting the flow of air and restoring the fuel-air ratio. You can't ignore this problem since the 'cheated' condition does not let the engine develop the power for which it was designed.    

Posted on Apr 26, 2009

haider_alhar
  • 90 Answers

SOURCE: 2002 suzuki LS 650 running lean at higher speeds, (off idle)

this prob happens allways in carburated engines that the car or motorcycle is running lean or rich . because the air - fuel mixture ratio is not right . so you should open the carburator and remove the air filter you will find two screws in the lower front section of your caeburator. you can adjust them by a screw driver until your car is smooth

Posted on May 31, 2009

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1 Answer

Have a problem with a dr650 went to a full stainless exhaust open up the air box fitted 150 main jet .NOW bike runs rich on idle can turn airscrew home and bike will not stop .Could it be a choke prob


If it is running rich you have the wrong size jet fitted, tuning a DR650 uses jets sizes from about 130 to 180 depending what has been done to the engine & bike

Oct 19, 2014 | Motorcycles

1 Answer

Will not stay running after choke closed


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. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting ***** set too low.
8. Air/fuel mixture ***** set too lean.
9. Idle port, transfer ports, slow air jet clogged.
10. Slow fuel jet clogged.
For more information about your issue and valuable "Free" downloads that you will need please Click on the links below Good luck and have a nice day.
Re Bike will not idle with out choke Road Star Forum Yamaha Road Star
Oakys Garage Carb clean Pilot Jet clogged Won run without Choke Carbs 101
http://www.yamahaventure.nl/pdf/servicemanualxvz13tf.pdf
OEM parts for Yamaha
http://www.yamahaventure.nl/pdf/ownersmanualxvz13tf.pdf

Apr 22, 2014 | 2007 Yamaha Royal Star Venture

1 Answer

Choke problem


That's an indication that the idle mixture is too lean, as the choke richens up the mixture, allowing it to run.

Your carb should be similar to this:

http://www5.picturepush.com/photo/a/3728808/img/3728808.jpg

The AIR SCREW adjusts the mixture (rich/lean), and the IDLE SCREW adjusts the idle SPEED.

Try screwing in the AIR SCREW 1/2 a turn and see if that helps.
If not, try another 1/2 turn.

Still no idle?

Turn the screw back where it was (1 full turn) and then screw it OUT 1/2 turn, then if not, another 1/2 turn.

Once you have the mixture correct, the idle speed can be set with the IDLE SCREW.

Jan 11, 2014 | 2003 ATK 125 4-stroke

2 Answers

2003 harley 1200 custom sportster with 50 miles strats up fine with choke pulled out. once engine is warm and choke is pushed in 50% bike stalls out. have repalaced gas, spark plugs and just took apart...


A 2003 model with only 50 miles?? Wow....well,since youve already taken the carb apart and cleaned it,did you hook up the vaccum line for the VOES switch on the intake manifold? If so,..when you get the bike running,..spray some brake clean around the intake where it bolts to the heads.If the idle picks up,or starts to sputter,..youve got leaking intake gaskets. Which is a good possibility on a bike that old with that few miles on it.The choke essentailly adds more fuel to the motor,and by what your saying,the bike is obviously running lean. Also,...im ASSUMING that you have fresh gas in it,and the petcock is turned on.

Sep 25, 2012 | 2003 Harley Davidson XL 1200 C Sportster...

2 Answers

After my bike warms up good it gets real sluggish. It takes about 15 minutes for this to occur. When it happens I have to rev the bike real high or it will die out like its not getting or getting to much...


You didn't say what year or model your bike was but if it runs better when it's cold than it does when it's hot, this is an indication that it's running rich. Does the bike start up and idle without the use of the choke or very little use of the choke? If so, another indication that it's rich. Take the air filter cover and element off, leave the backing plate on, and take the bike for a ride. If it runs better, yet another indicator that it's running too rich. What type of carb is on the bike? This is unusual as most bikes,unless they've been rejetted, are jetted lean and have a nasty habit of spitting back from the carb.

Steve

Aug 08, 2011 | Harley Davidson XL 1200 L Sporster Low...

1 Answer

I have a 1998 kawasaki 1500 classic that runs rich to the point where the fender is turning black. Riders behind say they smell strong odor of unburnt fuel. Bike idles smoothly and does not fog black out...


The easiest way to tell is have a look at the spark plugs and see what colour they are.
The should be a light brown, if black then you are running rich and will need to adjust your carbs.


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Please dont forget to vote this answer was helpful.

Many thanks

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Mar 04, 2011 | 2003 kawasaki VN 1500 Vulcan Classic...

1 Answer

Starts good cold with choke runs bogy until fully


You might be too rich on the pilot jet. (Too large)
Run it for a minute with the choke on, then shut the choke off, and let it run with just a little thrttle till it's warm. If it doesn't "clear" up, your jetting may be off. (The pilot does idle) Pull the plug to see what color it is. Black is too rich. (Too large of a jet)

Dec 08, 2009 | 2005 Suzuki RM 250

1 Answer

My 2005 Sherco 290 trials bike stalls when hot


Best would be to blow compressed air to the jets and also to check and reset the float level.
Hope this helps!

Oct 31, 2009 | 2007 Sherco 4.5i SM

1 Answer

02 crf450r starts up fine.... let choke off then


I have a crf 250 R and i have learned multiple things about these bikes like if you leave it running and not riding it for about ten min. it will over heat. they love race gas 113 octane,and alot more. but your prob sounds strange. i know if you hold the hot start while its runing it pops that could be a problem. or it could be you are not cleaning the bike out i would need to know more about this to give a definate answer but try going over the bike. Look at key parts like the
carb
air cleaner
fuel line
any thing that is nesessary for the bike to run.

Apr 14, 2009 | 2002 Honda CRF 450 R

1 Answer

Wont run /idle


i'd start with removing the carbs and giving them a thorough cleaning as when bikes sit for so long, the carbs begin to get gummy/varnished from the old gas.

check for blocked holes in the pilot jet & main jet and look for "hard & dried up" gas in passages. be careful of the float bowl gasket as to not tear it or you will need a replacement.

Mar 03, 2009 | 1999 kawasaki ZR-7

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