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Old 03-27-2011, 10:28 AM   #1
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ATV stalls when warm..

Folks, I use my ATV(07 500 Manual) almost everyday for plowing snow.. This year for whatever reason when it gets to operating temp it looses its idle and bogs out and stalls. To keep it running Im always adjusting up the idle. I have changed the plug but hasn't resolved this. Any help or guidance would be appreciated..
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Old 03-27-2011, 10:41 AM   #2
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Sounds to me maybe the choke is sticking. Or could even be the valves are in need of adjustment
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Old 03-27-2011, 10:45 PM   #3
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My universal reply to possible fuel related problems is to throw some rubbing alcohol or Seafoam in the gas tank. First step always, water in the fuel will present itself if crazy ways. Rubbing alcohol is free, stolen from the misses. Seafoam isn't too spendy, especially if it saves a carb cleaning.
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Old 03-28-2011, 09:04 AM   #4
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OK, I know I shouldn't do this but I am sorta going to Hijack this thread. I have the exact same problem with my sons 04 90cc.
I have cleaned the carb, installed new lines and filter, cleaned the fuel tank and still the same crap. Starts great, warms up and I have to adjust the idle up to keep it running. Did the seafoam thing too. So, Mags1 have you worked out your problem? Sorry again to Hijack the thread but we both have the same problem and I didn't want to start a new thread with the same topic.
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Old 03-28-2011, 11:31 AM   #5
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Sounds like a stuck or nonfunctional choke to me.
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Old 03-28-2011, 03:50 PM   #6
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Those electric chokes seem to fail in the off position, as in you need to prime the carb to get it to start.
I have never heard of one failing in the on position but I guess it's possible.
My first thought is the pilot metering circuit, remove the PM screw and spray cleaner thru the whole area as well as the pilot jet to make sure its squirting gas/cleaner into the throat of the carb and out the screw hole, then replace screw (turn screw in first to lightly seated position and count turns, then return to this setting) and spray cleaner into pilot jet again.
One question, when you say warmed up, do you mean 3 minutes of run time or 20 minutes? Because if it takes 20 minutes to act up it may be electrical, like a coil. Same goes for the 04 90cc machine. Once figured out, let us know what it was.
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Old 03-28-2011, 05:24 PM   #7
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Here's how the choke works on these machines (for those with the electric chokes anyways). The choke has some beeswax inside. When cold, it contracts and the choke needle is retracted...thus allowing fuel to flow through the starter jet into the mix. That's adding fuel (as compared to starving the motor for air). Now, once you start it, AC power from the stator heats up the beeswax in the choke, it expands, pushes out the needle and plugs that starter jet circuit. Now, if you're choke failed, then it's acting like it's permanently choked because it's not heating up and pushing that needle out.
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Old 03-28-2011, 06:20 PM   #8
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I had one go out on our 05 500. I didnt replace it for awhile because it was around $110 and I used the primer lever. I finally got fed up with the primer lever and purchased the new choke. What I had learned was that by just turning the key to the on position it didnt "warm up" the choke, it only had power going to it while the engine was cranking, (seems kinda wierd) and for about 3 months the quad ran fine but I had to keep one finger on the primer lever for at least the first 30 seconds or so to give it an extra shot if needed.
I guess mine failed in the closed position, never gave it a thought that they could fail in the open or enrichment position.
One thing for sure, our 03 500 had a hand operated lever for a choke and it never failed. I'm not sure why they would need an electric one when the term "if it anit broke, dont fix it" applies.
I was never a fan of the electric choke because of the high rpms the engine had while warming up on a cold engine, I tried to adjust that high idle part out of it and I think it's impossible. My next suggestion would be to see if the quad is spewing black smoke when it doesnt want to idle or if the spark plug is turning black. That for sure would mean an overly rich condition like a stuck open choke or a too large of a pilot jet, or pms screw turned way out or maybe it fell out??
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Old 04-05-2011, 05:03 PM   #9
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2007 90 cc

i have clean the carb new gas and treatment it will start but wont run good misfiring i put my hands on the air intake and gets better. were is the chock on this machine
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Old 04-09-2011, 09:09 AM   #10
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The choke on that 90cc is the white part on your carb.
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