Question about 2003 Yamaha YZF 600 R thunder cat

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Yamaha yzf600 wont start

97 new needle and seats, carbs cleaned, new air filter, fuel filter,and new battery road for 2hrs yesterday shut off a couple of times once goin down highway. thought it was a kinked gas line coming from petcock to fuel pump fixed and got me home. went to crank today and gas started coming from i think a bleed off line, but still wont start.

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  • DaveBShaw May 11, 2010

    If the gas is coming from a carb bowl overflow line, then one of your floats is probably stuck open. This would also flood one cylinder so one of your plugs should be wet after riding.

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  • Yamaha Master
  • 30,962 Answers

Hi, John 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 and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
YZF600R Forums View topic Carbs overflowing
Carbs leaking Here is how to fix it
Yamaha YZF600 YZF600R 1994 2007 Service Repair Manual PDF Download Manuals...
OEM parts for Yamaha
Yamaha YZF600RP Owner Manual

Posted on Aug 17, 2016

5 Suggested Answers

  • 8 Answers

SOURCE: 1985 Yamaha xj700 Maxim- Carb. fuel lines

yes, the breather line hooks to the petcock on the line facing the back, the fuel line hooks to the larger one. the line from the breather is actually a vacume line that turns on the fuel, without it you will not get fuel out of the petcock unless it is in the prime position.

Posted on Jul 04, 2009

  • 12 Answers

SOURCE: engine flooding gas building exceessive pressure

Remove the fuel cap and try it. If the problem disappears, you need a new cap as the vent has become plugged up.

Posted on Mar 21, 2010

  • 346 Answers

SOURCE: My yamaha yzf600 sat for 3 years, it will idle but

You'll need to disassemble your carbs and manually clean the jets, and ensure that if you have CV-type carbs, you can see all the needle holders rising when you roll on the throttle.

Posted on Jul 24, 2010

SOURCE: Working on a friends 81

The petcock on these bikes is vacuum operated, which means that there are two hoses that go to it. The thicker hose is the fuel line and it runs from the thick port on the petcock to the fuel input on the carburetor rack. The fuel input on the carburetors is located between the number two and number three carburetor bodies. If you aren't sure which is the fuel connection, just turn the petcock switch to prime for a second and you will see gas come out of the fuel connection.

The thinner hose on the petcock is a vacuum line. It runs from the vacuum port on the #3 cylinder (between the carburetor body and the engine) up to the smaller connection on your petcock. When the engine is turning vacuum is applied to this thinner line and allows fuel to run from the tank into the carburetors.
joshorndorff.jpg

There are the only two lines that should run to your petcock, and the fuel line should not be split anywhere between the petcock and the carburetors.

Good Luck,
-Josh

Posted on Mar 13, 2011

Testimonial: "Thank you for the feedback, It was very helpful. I had been told that both ports on the intake were to be plugged, which added to my confusion, Ted"

HansPP
  • 2510 Answers

SOURCE: i have a yamaha 650

Cleaning the fuel tap and any filter on it would be a positive step. Also check the fuel hose that it is clear and that the float needles and seats are opening and allowing gas into the float chamber.

Posted on May 06, 2011

Testimonial: "im gonna try what you said. but could it be the petcock????"

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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.
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8. Air/fuel mixture ***** set too lean.
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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.
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My 1996 yamaha yzf600r will attempt to run if i hold my hand over carbs i have took the bowls off and the pilot jets and needles and cleaned them really good and if i dont hold my hand over them and turn...


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 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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Hi, Ktatejr86 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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Hi, Ktatejr86 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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Hi, Rhiannon_mat and the usual suspects are:
1. Idle circuit and transfer ports clogged.
2. Air fuel mixture adjustment too lean.
3. Pilot jet clogged.
4. Faulty accelerator pump.
5. Float level too low.
6. Float bowl contaminated old fuel, water, dirt, rust, etc.
7. Float bowl vent or overflow tube clogged.
8. Fuel flow to carburetor restricted.
9. Intake manifold leak.
10. The gas cap is not venting properly or fuel tank venting system blocked.
11. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
12. Needle and seat stuck closed in the float bowl.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
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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 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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Hi, Cnester10 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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1 Answer

My yamaha yzf600 sat for 3 years, it will idle but dies when i give it throttle, it has new gas,fuel filter,sprayed carb cleaner in carbs!! new air filter.


You'll need to disassemble your carbs and manually clean the jets, and ensure that if you have CV-type carbs, you can see all the needle holders rising when you roll on the throttle.

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1 Answer

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