Brantley11

I am 99% sure that it is the CDI box but my brother in law is leery of spending $500 on the CDI because what if it doesn't work or fix the problem. If anyone has a CDI that I could borrow or buy cheaply that would be awesome.

All hoses and breathers are clear and functioning. The carb diaphram doesn't have any holes in it and I have cleaned the carb in ultrasonic cleaner three times. All jets are stock size from Shindy. I got it to idle well and take some gas to move it forward and reverse last night after the CDI box had been in the oven for 30 minutes or so at 350. This leads me to believe that it is a faulty CDI box. The new CDI box from Yamaha is $400-500 and my brother in law isn't really wanting to spend that $$$ without 100% assurance that that is the exact problem. We are waiting to find someone local that has a running grizzly to swap the CDI and see if that fixes the issue. If anyone on here wants to make me a good deal on a CDI for 2000 Grizzly 600 let me know.

Put a new coil and stator on it. It fires up and idles well but as soon as you give it gas it dies. I have cleaned the carb three times and tank twice. Brand new spark plug and gas. Adjusted the pilot screw and it still does the same thing. Any ideas? HERE is a video showing what it is doing.

I think I just answered my own questions but would you please confirm? If I take the head cover off and see that the indicator marks on the cam shaft sprocket are lined up like in this picture and the TDC mark on the flywheel is lined up on the sight window, then my timing should be on, right?

I could I visually tell if the timing chain jumped one tooth? Make sure the indicators on the cam shaft are correct when the flywheel mark is lined up in the sight window?

It's not consistent and there is no rhyme or reason to it. The longest it will stay running is 3 seconds but that is not often. We tried full choke, half choke and no choke. It didn't change the results. If we give it throttle when it starts it always dies....we cannot keep it running with the throttle. Timing light test, yes the spark is there until the last rotation of the motor. The exhaust flows well, I checked all four values last night and there were all within spec. The carb is clean as a whistle and gas is filling the bowl and wetting the spark plug. Throttle does not help it run nor start. Once it sputters it won't start for a little while. But in 30 minutes holding it for 3 seconds of so) of pushing the starter button it only started for a second or two 4 times. It did make a few bubbling or gulping sounds when we were trying to start it though.

Hey everybody, My proficiency is with Hondas and Yamahas make me see RED! This bike is my brother in law's, it has 1199 miles on it and went from running great to dead with no start. Every once and a while it will start and sputter for 2 seconds. It is extremely sporadic when it fires but never runs for longer than 3 seconds. Here is where we sit: Brand New Fully Charged Battery Carb was cleaned with air hose and carb cleaner then into the ultrasonic cleaner with Aircraft aluminum cleaner New Shindy Carb kit (made in Japan version) Cleaned out petcock and gas tank New 93 Non Ethanol Gas New Spark Plug It gets a spark through the spark test light every time Bluish white spark When holding the spark plug 1/4" - 3/8" away from head it will jump and spark to the head Good Compression Here are the readings: Pickup Coil 519 Ohms (range 459-561) Charging Coil 266 Ohms (range 270-330) Lighting Coil 0.700 (range 0.702-0.858) Spark plug Cap 10.58 Ohms (10kohms Ignition Coil Primary Coil 0.5 ohms (range 0.18-0.28 ohms) Ignition Coil Secondary Coil 8.20 kOhms (range 6.32-9.48 kOhms) Would y'all think stator and pick up coil, rectifier or CDI are the culprit?

Y'all keep it up and once you have the manual come back and share what you found out.

I grew up with one exactly like that. I loved how light it was (very easy to pick up over fences and out of mud holes.) I bought my 11 year old one last year and he loves it.

I use 93 non ethanol gas and I drain it after the season. Even though I never use ethanol i still have to clean the carb ever 2-3 years. The gas just isn't what it used to be.

I have a NOCO 4 bank and it is amazing. It even has settings for AGM and traditional batteries.

Besides the electrical problems i always disliked the u joints and such for the 4x4 system. They were always difficult to access and replace.

I have an LTZ50 2006 model and it performed a lof better when I put the LTZ90 CDI box on it. It allows the RPMs to double thus more MPH and fun for my kids

I was able to find one for a KFX 50 by googling kfx50 service manual PDF.

That's great. He will love it.