Brantley Foreman

So before I bought the new OEM carb I cleaned 3 OEM carbs that I had. They all behaved in the same way. I adjusted the air fuel mixture screw out 3.5 times or as much as I could before it fell out and this did not change the difficulty in starting. I adjusted the clip on the needle jet with no change in the behavior. This is why I think it is not carb issue but honestly I don't know anymore. You know how it is when you have been fighting something for 3 years you just get tired!

Shadetree I’ll be in north little rock in June fixing a wall failure on I-630. How about I drop off my 450 and see if you can figure it out. After 2-3 years of messing with it I’m tired?

I did flush the tank and installed new Honda peacock. Fuel flow to carb is great. choke cable moves freely and functions properly it’s weird that the only problem is the first start of the day and 0 - 1/4 throttle. Other than that it runs great

Yes, oem Honda parts from Honda dealers in Louisiana, Arkansas and Mississippi. I searched hard to find all the parts but I found them. Everything came I. Honda packaging. all the timing marks are lined up. I just went on a 10 miles ride with my son (mostly full throttle on gravel road) and it ran great. Only backfilled once on a deceleration at stop sign. it just doesn’t like starting and 0- 1/4 throttle.

I’m at my whitts end on this four wheeler heres what’s been replaced with OEM new parts new valves lapped and seated well. Valves Adjusted properly new boot to cylinder head and air box new CDI new coil and red boot new rectifier new Honda carb new armortech stock muffler new head pipe and copper gasket new air filter new piston, cylinder and rings 100 miles ago the muffler has a high pitch whistle. I’ve sprayed starter fluid around all intake boots and it doesn’t change. new DID timing / cam chain 100 miles ago. Timing is set right. I checked it 3 times. it is hard to start and sputters 0 - 1/4 throttle. Good top speed and after running for awhile it runs well but still a little hot for my liking. Having the airbox cover off doesn’t help the issue.

Here is the broken brass tube. It doesn’t show up on any micro fiche and I’m not sure it can be replaced. but it wasn’t allowing suction to build up.

So I finally figured the issue out. The brass tube that does from the fuel bowl to the top on the outside of the card had cracked thus not allowing vacuum. Put a new carb on it and ran perfectly. I will try to find a good picture of the tube but very glad to have this issue behind me.

Hitting this back up to see if anyone has a CDI that they would sell me cheap?????

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?

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.

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?

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.

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

It's crazy, I know bunches of folks that run 25" tires on 300 without gear reduction with no problems. Also the tires and rims were brand new from honda....never used until this machine and it started from day one. You think its just too much tire for a stock gear ratio?

up on jacks without tires no problems. i guess it is either, larger tires, same size tires all around, bent rim or unbalanced! Any thoughts?