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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Re: Bought a 2000 yamaha yzf600r which had a bad idling...
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
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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!
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.
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?
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. http://www.r6-forum.com/forums/57-garage-mechanical-help/318058-2001-r6-idle-carb-issue.html YZF600R Idle Problem Rev Problem 1999 2002 Yamaha YZF R6 Service Manual R6 Moto Data Project OEM parts for Yamaha http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals
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.