Question about 2003 Yamaha YZF 600 R thunder cat

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Clog carb I think the low speed part or the carb is gummed up.  The bike does not idle without the choke on.  It will stall if you don't have 2k on the tach.  Will gum out or similar product work if added to the gas tank?

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Better to strip the carbs and make sure the pilot jets are clear, i dont like using 'cleaners' in the tank.

Posted on Jun 17, 2009

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Same problem with my '02 after sitting for a winter. Run the bike for a minute then feel the pipes, the hot ones are OK, the cooler one in the cylinder with the problem. Take off the tank and loosen the drain valves on the carbs. Squirt carb cleaner into the drain, either with a hose or large hypo needle on the end or the plastic tube that comes with the cleaner. Shoot a lot in, enough to fill the bowl. Tighten the drain and let it sit for a day then it should be OK.

Posted on Apr 10, 2010

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Run down to Autozone/Pepboys and pick up a can of seafoam...

Probably one of the best fuel system cleaners on the market... If seafoam won't clean it up..then pretty much I doubt anything will other than pulling the carbs off..

Posted on Jun 20, 2009

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1 Answer

Only runs with choke on


Hi, Jeff 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.
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Idles with 1/2 choke. If open choke, or throttle - engine dies without any RPM spike. Carb was cleaned, jet is clean. When idles, there is gas in the primer bulb.


Hi, Andrew 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 screw set too low.

8. Air/fuel mixture screw 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 visit the websites below. Good luck and have a nice day.

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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
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http://www.yamahaventure.nl/pdf/servicemanualxvz13tf.pdf
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1 Answer

Eng runs with choke stalls at idle with choke off after a couple of minutes


Jets are clogged. When the choke is on you cut the air and the mixture is good, with it off to much air. Dont know the carb you have but the low rpm jet is clogged. should clean the whole carb. Gas will gum up in 6 months if not treated with some stableizer.

Dec 19, 2012 | Motorcycles

1 Answer

I have a 2006 v star 1100 with aftermarket pipes and a jet kit installed. It sat for months and I rebuilt the carbs. Now the bike will only idle with the choke on, are my carbs out of sink?


Hi, Lancer 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 screw set too low.
8. Air/fuel mixture screw set too lean.
9. Idle port, transfer ports, slow air jet clogged.
10. Slow fuel jet clogged.
11. Faulty fuel pump.
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.
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http://www.sloneservices.com/SilverBack/Other-Stuff/V-StarShopManual99-07.pdf
OEM parts for Yamaha
http://www.starmotorcycles.com/assets/service/manuals/2000/LIT-11626-13-36_96.pdf

Nov 07, 2012 | 2002 Yamaha V Star 1100 Classic

1 Answer

Just picked up this 1996 GPZ 1100 ABS. Starts ok with full choke but does not idle. Need to keep the choke on to keep the bike running. Once I close the choke the bike does not idle. Checked for air...


It sounds like the carbs are gummed up from sitting. The fuel that we get now is very unstable and gums up quickly. When you choke the bike it is bypassing the carbs and that is why it runs. I would suggest a carb clean and fuel tank flush, the carbs are very intricate and should only be worked on by a qualified technician.
Thanks,
Steve

Jan 03, 2011 | 1996 kawasaki GPZ 1100

1 Answer

My 2005 Katana is stalling left and right


Has the bike been sitting for any time longer than 4 days? 4 days is enough to clog idle jets. Cleaning the carbs if it has carbs, is the first defense against idle to low rpm stalls. Pull the carbs and clean them out. Definitley will help you out.

Oct 19, 2009 | 2005 Suzuki GSX 600 F (Katana)

1 Answer

Cbr 250 wont idle without choke


Dirty carbs. Remove from bike and disassemble each carb and clean them thoroughly. one or more of the small passageways in the carb can be clogged with a small piece of dirt or eve carbon build up. Stale fuel will "gum" them up to

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1 Answer

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I think your bike has a CV carb which doesn't have a choke.It's called an enrichener. Pulling out the "choke" knob merely dumps more gas into the carb. If the bike starts normally with the knob pulled out, you do not have a problem. On a cold/cool day, pull the knob out and start the bike. If it idles faster than normal the system is working. Pushing the knob in should drop the idle speed, maybe stalling the bike if it is not fully warmend up.

Apr 18, 2009 | 2006 Harley Davidson XL 883 Sportster

1 Answer

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.

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