Question about 2000 Yamaha YZF-R6

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Bought a 2000 yamaha yzf600r which had a bad idling problem. Bike sat for a year. I cleaned the carbs, flushed the tank. Drilled out pilot caps and set the screws to 2.5 turns out as the original screw settings were #1-4 turns #2-.75 #3- 2 turns and #4-was completely closed. Carbs were terribly out of sync. I synched the carbs and the bike runs better than ever but failed emissions. They say its running too lean. I'm thinking I either have to readjust the fuel/air screw or they said possibly a plug is misfiring. Took the plugs out and they look fine. Plugs only have about 200 miles on them. I live in Arizona. Any Ideas?

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You can fail emissions on a bike in arizona ? Wow i thought california was bad....anyhoo let's get to your concerns....All those srews should be very close to the same setting....rule of thumb is start at 1and1/2 turns out on each screw, almost any gasoline engine will run at these setting then you can fine tune from there.....no wonder you had bad idling problems...Good luck to you friend....Tim

Posted on May 12, 2009

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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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Oct 30, 2013 | 1996 Yamaha YZF 600 R thunder cat

1 Answer

Bike runs rich, rough, idles and starts fine but dies when you hit the throttle. allways ran great untill i parked it for 3 weeks.


Hi, Sandmanaz 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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Feb 12, 2012 | 2002 Yamaha YZF 600 R thunder cat

1 Answer

I have a 1992 yamaha seca 600.Bike was parked for 2 years.I cleaned carbs 2x.Bike idles fine ,but when I give it a little throttle it dies..Please help...I bought this thing to go to work..Ive put a lot of...


Sounds like you still have a fuel delivery problem...How did you clean the carbs? The jets, pilots, floats and circuits in these carbs are hard to get throughly clean. I use a small steel guitar wire to clean with...A tiny pin hole in the diaphram, or dirty or stuck choke circuit will cause problems.The floats need to be set correctly... I recommend an ultrasonic carburetor cleaning for best results. Consider installing carb kits, they are not very expensive and come with new jets, float valve needles and gaskets...The bike has been sitting 2 years, did you service the fuel petcock and flush and clean the gas tank?
Also the carbs need to be "synched" after they installed...all matched and in time with each other...check for vacuum leaks around the carb boots and cylinder head...check all the vacuum lines for any cracks or leaks....Check all your electrical connectors for signs of corrision, if they are dirty, clean them, they should all be shiny. Check your grounds, the main ground from battery to frame is a problem area... where it grounds to frame usually rusts and cant be seen until you remove it...A clean electrical circuit will provide you with a hotter spark at the plugs and improve performance.

These are good bikes, just take your time and go over it. She will be back on the road again in no time. I hope this helps---Good luck with your bike!

Jul 16, 2011 | 1992 Yamaha XJ 600 Diversion S

1 Answer

Hit the gas and the engine almost dies. Idles and starts fine. Changed the spark plug - no change.


What kind of bike? It sounds like clogged carbs, if pilot jets are plugged from lack of service or sitting for a while then your bike could still start but will fall on its face when opening throttle due to lack of fuel, solution=clean your carbs thoroughly and flush your tank.

Jun 10, 2011 | Yamaha B50 Cross Junior Motorcycles

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.
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May 01, 2011 | 2002 Yamaha YZF 600 R thunder cat

1 Answer

I bought a 99 yamaha yz250 that had two tanks of gas through it it wont idle right and when it is idling it surges this bike is brand new 12 year old bike perfect i dont know what the problem is


It can only be carbi more than like pilot jet and or air jet the simple answer is clean all jets but I personally would buy and replace all jets and throw the old ones in the bin if the bike has sat for years they would be rubbish by now
if your not confident with carbi just un install it and take to local bike shop they will service it pretty cheap would only take them 30 minutes ish?

Mar 04, 2011 | 2003 Yamaha YZ 250

1 Answer

Yamaha r6 2000 has been sitting for a little while now the problem is the engine only revs without the air filter and air filter box top cover help?


Hi, Irmantass666 try cleaning your air filter if your bike has been sitting idle for months or years and you did not do any pre-storage maintenance I feel your pain it will probably have a dead battery and not want to start or if it starts it will idle and run poorly then stall, here are the following steps necessary to complete in order to get your bike back to an acceptable running condition.
1. If your battery was 2-3 years old when you last had the bike running you should replace it.
2. If you believe your battery might still be serviceable remove it from the bike and put it on a 1 or 2 amp trickle charger for 24 hours. If it is the old lead acid type with visible cells and acid levels fill each cell to the top line with distilled water and replace the caps, run the vent tube into a plastic or styrofoam cup, any cells that are cloudy/milky replace the battery.
3. After charging remove the leads and let the battery sit for a couple of hours then check the battery voltage with a volt meter, you should have 12.5 volts or better, any readings in the 11 volt range you need to do a proper load test on the battery and replace as necessary, any readings in the 10 volt range you have a dead cell and the battery needs to be replaced.
4. Drain and flush fuel tank, google " how to clean a motorcycle gas tank" find a couple forums to view the different options available.
5. Remove and inspect your air cleaner paper elements that are not oil soaked can be cleaned with a soft brush and low pressure compressed air, oil soaked elements must be replaced. Gause mesh and foam elements can be cleaned by soaking them in a container big enough to completely cover them with a solution of 1 gallon of water and 1 oz. of Dawn dishwashing liquid for small and medium size elements, for monster size double the formula and let soak for at least one hour then rinse with warm water shake off excess and let air dry, "WARNING" do not use compressed air as this will embed micro-sized dirt and road grime and destroy the mesh pattern and stretch foam elements out of shape just squeeze it like a sponge and let air dry, use a fan if you're in a hurry. When completely dry spray a very fine mist of air filter oil evenly around the whole element.
6. Remove the carburetors, disassemble and decontaminate with a carb dip or if you have EFI remove injectors and clean with carb spray and compressed air
7. Remove fuel valve and filter disassemble and clean as necessary, remove, clean, and inspect fuel and vacuum lines and replace as necessary.
8. Replace spark plugs with new ones and check for spark.
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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2 Answers

Bike sat for awhile, runs but doesnt idle very good. cuts out


I would remove and clean the sparkplugs - sounds like one may be fouled.

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2 Answers

Won't idle without choke


The pilot jet controls the air/gas fuel mix at idle . If the jet gets plugged up not enough gas gets to the emgine at idle. You will need to remove the carbs and float bowls and clean them, paying special attention to the pilot valve. Count the number of turns to remove the pilot screw and replace the same number of turns then turn counter clockwise 1/2 turn.

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1 Answer

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

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