Question about 2005 Yamaha YZF 600 R thunder cat

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I just purchased a 2005 Yamaha YZF600R with 500 miles on it. More often than not when at idle or coming to a idle from riding the rpms when shoot up, revving itself to redline for no apparent reason. Carb was taken off and cleaned, throttle cable adjusted. Its quite concerning to say the least...

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Hi, David and the usual suspects are:
1. Throttle cables improperly adjusted, pinched or need lubrication.
2. Idle adjusting screw needs to be backed off.
4. Air fuel mixture adjusted too lean start with 2 full turns.
5. Intake system air leak.
6. Fast idle choke ramp is not releasing.
7. Broken throttle return spring.
8. Damaged diaphragm or slide.
9. Faulty MAP, TPS, ATS, O2, sensors or wiring/connector
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.
YZF600R Forums View topic Idle Speed
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Yamaha YZF600 YZF600R 1994 2007 Service Repair Manual PDF Download Manuals...
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Yamaha YZF600RP Owner Manual

Posted on Aug 15, 2016

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SOURCE: 2005 yamaha yzf 250-unstable idle

I had the same problem, Turns out that my shims were finished, replace the chims and check clearences.

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SOURCE: 2005 VSTAR 1100 Silverado Backfire

Are you running on original pipes or have you installed aftermarket pipes that are louder ?? I had the same problem with aftermarket pipes and come to find out my carbs were not jetted the way they were supposed to have been done when I installed the pipes.Also there are two chrome tubes starting at the front of the engine going under the seat towards the rear--- there is a rubber hose connection connecting each side .You should disconnect these hoses and bypass the tubes-- in other words use one hose to connect the front two tubes together and the other to connect the rear tubes together , its some sort of early emmission thing that will cause some backfire

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SOURCE: Yamaha TTR 250, Idling Problem

check the inlet manifold rubber has not seperated from the aluminium part of the manifold ,this is very common on the ttr 250 and will cause the exact problem you have,if it is seperated either replace it or repair it with some good quality rtv sealant avoid sillicone sealant as it is not petrol resistant and will turn to jelly.adam

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SOURCE: 83 yamaha tt600e no spark

The CDI unit on the 83 model (TT600) is located under the fuel tank and suffers from heat
exposure.The solution is to get specialist help to open up the sealed CDI unit and repair/
replace internal connections (which are readily available electronic components)
When you re-install it put some heat shielding material there to protect it and this
will be OK as repair will utilise stronger parts,I think.
Later models have the CDI unit moved to the head-stem area.

(this info from a Non-mechanic who remembers what was done to his TT in Australia, many years
ago)

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SOURCE: Clutch slipping (only is 2nd gear), on yzf600r

the problem is in the gearbox not in clutch

Posted on Jul 07, 2009

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02 yamaha yzf600r when riding pull in clutch rpms stay high come to stop they will come down slowly


Hi, Anonymous and the usual suspects are:
1. Throttle cables improperly adjusted or pinched.
2. Idle adjusting screw needs to be backed off.
4. Air fuel mixture adjusted too lean start with 2 full turns.
5. Intake system air leak.
6. Fast idle choke ramp is not releasing.
7. Broken throttle return spring.
8. Damaged diaphragm or slide.
9. Faulty MAP, TPS, ATS, O2, sensors or wiring/connector
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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Yamaha YZF600 YZF600R 1994 2007 Service Repair Manual PDF Download Manuals...
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May 07, 2014 | 2002 Yamaha YZF 600 R thunder cat

1 Answer

I have a 2005 yamaha yzf 600. Idles rough and stalls. Revs ok


Hi, Anonymous 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.
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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Won Idle Choke
Yamaha YZF600 YZF600R 1994 2007 Service Repair Manual PDF Download Manuals...
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Aug 02, 2012 | 2005 Yamaha YZF 600 R thunder cat

1 Answer

My 2003 yamaha yzf 600 seems to be overheating. I was riding the other day and fan was kicking on just before it got in the red on temp guage is this normal.


Hi, John and the usual suspects are:
1. Low coolant level.
2. Restricted radiator air flow.
3. Faulty thermostat.
4. Coolant pump or fans inoperative.
5. Vent hose crimped.
6. Air in the coolant and needs bleeding.
7. Engine idling too long or bike moving too slow.
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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Jun 10, 2012 | 2003 Yamaha YZF 600 R thunder cat

1 Answer

I have 1998 r1 and it's high reving on idle


Hi, Steve and the usual suspects are:
1. Throttle cables improperly adjusted, pinched or need lubrication.
2. Idle adjusting screw needs to be backed off.
4. Air fuel mixture adjusted too lean start with 2 full turns.
5. Intake system air leak.
6. Fast idle choke ramp is not releasing.
7. Broken throttle return spring.
8. Damaged diaphragm or slide.
9. Faulty MAP, TPS, ATS, O2, sensors or wiring/connector
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.
http://www.r1-forum.com/forums/101-98-99-r1-mechanical-help/291640-slow-rpm-return-idle.html
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1998 1999 Yamaha YZF R1 Service Manual R1 Moto Data Project
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http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

May 26, 2012 | 1998 Yamaha YZF-R1

1 Answer

PLEASE HELP please help 2006 yamaha yzf600r i have a problem ..... around 5000 rpm i get little tingeling vibrstions in the foot pegs handle bars and sometime in the tank i guess it like buzzing 5000...


Hi, Krisloba and the usual suspects are:
1. Wheels and or tires worn or damaged.
2. Engine/transmission/vehicle not aligned properly.
3. Primary chain is badly worn or links too tight as a result of insufficient lubrication or misalignment.
4. Engine to transmission mounting bolts loose.
5. Upper engine mounting bracket loose.
6. Ignition timing incorrect due to a poorly tuned engine.
7. Internal engine problem flywheels have shifted.
8. Broken frame.
9. Stabilizer links worn or loose.
10. Rubber mounts loose or worn.
11. Rear fork pivot shaft nuts loose.
12. Front engine mounting bolts loose.
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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Jul 20, 2011 | 1999 Yamaha YZF 600 R thunder cat

1 Answer

2003 yamaha yzf600r carbureted, When I twist the throttle (fast or slow) it sputters for a second then revs up and just sits at 4000 rpms, even if i just poke the throttle at idle it will rise up to 4...


Hi, Striker_1011 and the usual suspects are:
1. Throttle cables improperly adjusted, pinched or need lubrication.
2. Idle adjusting screw needs to be backed off.
4. Air fuel mixture adjusted too lean start with 2 full turns.
5. Intake system air leak.
6. Fast idle choke ramp is not releasing.
7. Broken throttle return spring.
8. Damaged diaphragm or slide.
9. Faulty MAP, TPS, ATS, O2, sensors or wiring/connector
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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May 02, 2011 | 2003 Yamaha YZF 600 R thunder cat

1 Answer

I have a 1995 YZF 600. Its running a little rough but idles at about 2,500 rpms once the engine is warm, yet the engine still stalls out when the choke is not on. I have cleaned the carbs, and there in...


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.
YZF600R Forums View topic Wont run without choke on full
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May 01, 2011 | 2002 Yamaha YZF 600 R thunder cat

1 Answer

97 yamaha 600r at idle the rpms slowly drop insted of a sharp drop when throttle is let off thinking the jets maybe stopped up or has a fuel return issue, or the carbs are not in sync. thanks


Hi, Etka2800 and the usual suspects are:
1. Idle speed improperly adjusted.
2. Air fuel mixture screws not properly adjusted.
3. Inlet system air leak.
4. Leaking accelerator pump.
5. Loose low-speed jet.
6. Plugged low-speed jet.
7. Contaminated or plugged low-speed circuit.
8. Enrichner valve/choke not seated or leaking.
9. Multi carburetors out of sync and need to be balanced.
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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Dec 13, 2010 | 1997 Yamaha YZF 600 R thunder cat

1 Answer

Have a 2005 Yamaha YZF 600 that seems to be loosing tach signal. Goes from zero to 8K. Woun't idle unless full choke.


Hi, Msands1027 you have a fuel sending unit issue for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere $10 you can download another one. 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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Oct 30, 2010 | 2005 Yamaha YZF 600 R thunder cat

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