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Brantley Foreman

2000 YAMAHA GRIZZLY 600 ELECTRICAL ISSUES

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Hey everybody,

 

It has been a while and haven't been working on machines for a little bit, but I ran into a stumper. 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 (I have attached the electrical section from the service manual):

 

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?

Yamaha 600 Grizzly Service Manual Electrical Section.pdf

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Just now, ATC4ever said:

How long does it sit before it will start again?

It doesn't every really start and run longer than a second or two.  You can tell it on the verge of running but dies out after the initial fire.

 

It can sit for days and not attempt to fire and run or it can sit 10 seconds and it will fire off but only run for a second or two.

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Theres no chance its the float height, or dirt in there? What about the tank breather? I only ask this cause i frigged with a YTM225 the yesterday after it wouldnt run good & there was a chunk of crap in the carb in the fuel line nipple. Just another thing to check is all. You said you have spark. 🤔

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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?

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1 hour ago, Brantley Foreman said:

 

 

 

 

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?

have you checked the timing by any chance ??.

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Check #2 in this pic.  It is a diaphragm.  If it has a crack or hole. Then it won’t accept gas on the mid to high range. image.pngYea 

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6 hours ago, shadetree said:

have you checked the timing by any chance ??.

 

Yes, and I just did it again. It is at TDC Compression stroke, marks on the flywheel and camshaft are correct and the valves have correct lash adjustment.

 

New spark plug, new coil, new stator, carb has been cleaned in ultrasonic cleaner, tank has been cleaned out and new non ethanol 93 gas. 

 

I don't know what else to do!

 

Also compression is 110 PSI.

Edited by Brantley Foreman
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Curious if the pickup coil was replaced when the stator was done? I've seen more than one Yamaha have a bad one.

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8 minutes ago, spock said:

Curious if the pickup coil was replaced when the stator was done? I've seen more than one Yamaha have a bad one.

 Yes, I replaced the pickup coil and charge coil together.  I also checked the flywheel woodruff key it was in perfect shape and I put the flywheel back on.

 

The ignition coil was replaced as well.

 

I got desperate last night at 12am and put the CDI in the oven at 350 for 2 hours. Once it cooled I put in back on the bike and it fired right up and ran well. I was able to drive it around a little bit but after 20 minutes it started acting up again.

 

You think that and all of the previous things I have done point to the CDI box?

 

If so, does anyone have a CDI box from a grizzly 600 that they would make a me good deal on?

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