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Old 05-01-2010, 12:42 PM   #1 (permalink)
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Possible mixture issues

Hi Guys

I need some help. I have a 2000 300ex and it is sputtering/running rough whenever I hit water. I feel that it is a mixture issue.

I bought this quad a couple of months back. I have rebuild the top end because it was popping back into the airbox. I thought it had a bad valve or cam. I realized after I tore it down the pilot screw was all the way in. Too lean causing it to pop back. I rebuilt it anyway since I had it a part so it is now bone stock 40 over 300ex. Once I got it back together I tried to adjust the pilot screw. The book says to start out at 2.25 turns out and back it out until it sputters/idle drop and the turn it in until it sputters/idle drop and then put it in the middle. I have not been able to make it drop by backing it out. I bought new jets and the same thing. The stock slow is a #38. I have tried a #40 and a 45 and the same thing. Anyway I set it to 3 turns out using the 38 and it runs good once warmed up.

Here are some symtoms/ possible issues.
1 It will always start without the choke.(I never had a quad that would do that)
2. When it is cold it will sptter and spit a little. (NBD)
3. When I hit water it will sputter and spit. It will also sometimes die and not want to restart right away. If I put the choke on it will start right up.
4. The plug looks like it is running rich but I have never done a plug test on a low speed jet/mixture.

I also have replaced and checked all rubber boots on the carb. I have tried the carb cleaner/water test. All is good on that front. I don't think it is electrical because if I put the choke on it will start right up.


Any help would appreciated
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Old 05-01-2010, 12:51 PM   #2 (permalink)
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Welcome to the forums. Have you tried cleaning the carb? It does sound like it might be running rich. I think most of those 300EX's have to be choked, when cold, and they have to warm up for a few minutes or they will sputter.
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Old 05-01-2010, 12:58 PM   #3 (permalink)
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Thanks!!!

I have cleanded out the carb. I also put new jets and new pilot screw.
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Old 05-01-2010, 01:01 PM   #4 (permalink)
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Quote:
Originally Posted by tegan7474 View Post
Thanks!!!

I have cleanded out the carb. I also put new jets and new pilot screw.
I'm not as familiar with the sport models as I am with the utility models, but Moose or Billy should be able to help you when they get on here.
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Old 05-01-2010, 01:19 PM   #5 (permalink)
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I know you said you cleaned the carb, but did you clean the passageways out in the carb body? A tiny piece of debris can clog those up and make it not run right. To me, it sounds like you have some debris still in the carb somewhere, but I could be wrong.

If you ride through a lot of water, I would put dielectric grease on all the plugs and connections and also around the spark plug boot. It's a good ideal to do that, anyway, even if you don't go through a lot of water. It'll help prevent problems at the wiring connections in the future.
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Old 05-01-2010, 04:21 PM   #6 (permalink)
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Thanks for the tips. I do have grease on all of the electrical. What I fid confusing is that after I hit the water it behaves as if it is lean. When I start it cold without he choke is a sign of being rich. If I run at half or full throttle after hitting the water it is fine. On the pilot circuit it sputters until it warms up again.

Thanks again
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Old 05-01-2010, 05:09 PM   #7 (permalink)
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Sounds lean to me.It shouldn't spit much if it's rich.Did you put a new main jet in?And what number was it.Some used a 118 and some a 122.
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Old 05-01-2010, 05:47 PM   #8 (permalink)
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Hey Billy

It is a 122. It always runs great past 1/4 throttle. It always idles well if it is running. It runs rough from idle to 1/4 throttle when it is cold and when I go in water. I think the water is cooling it back to a cold state because it behaves the same as when I cold start it. It sounds like maybe I am lean on the pilot circuit.

I have cleaned the carb and I am running a 38 pilot. I started at 2.5 turns out and turned it in. It started popping back into the airbox at 1.25 turns out or so and the idle got slower. I backed it out and the idle increase up until about 2.25. After 2.25 turns I could not notice a difference. I went all the way out to 4 turns. Throttle response did not change past 2.25 and it never ran bad. My understanding is that I should be able to adjust the pilot to a point where it is so rich it will not run. Do you know if that is true? I tries it with a 40 and a 45 too and could never get it to a full rich condition.


It also pops a little out the exhaust on decel when it is cold.
Can I do a plug test on the pilot circuit by putting a new plug in and just let it until until it warms up?


I am lost at this point. I would think it would will be pig rich with a 45 pilot on a basically stock machine. (all stock except 40 over bore.

Thanks again for all the help
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Old 05-01-2010, 05:57 PM   #9 (permalink)
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The way you are describing it now, it does sound lean. Usually when you have to turn your pilot screw out as much as 4 turns, then you need to go up on your pilot jet. I believe you said you already tried that, though, but that's the reason why I asked if you had cleaned the passageways in the carb body. It sounds like there might be some debris still in the pilot circuit. When you turn your pilot screw out to a certain point, it should stumble.
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Old 05-01-2010, 06:07 PM   #10 (permalink)
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OK

I will try that. What do you suggest? Carb cleaner in that little passage way that the pilot screw plugs up when it is all the way in? It does sound like the pilot circuit is lean but one thing does not make sense. I can start it all day long without the choke when it is cold. Isn't that a symptom of being rich?

Thanks again for all of your help guys
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