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Old 02-27-2012, 03:49 PM   #1
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AC 90-youth carburetor in cold weather-Colorado

I have a 2005 arctic cat 90 youth that ran fine in the summer months. i tried starting it in the winter and would barely keep idle. I assume it is b/c of the cold air/dense air, and i need to change my pilot jet. The stock jet in there now is a 40. does anyone know what jet to use for high altitude and cold weather, i live in denver, colorado and for temperatures in the 30's.

Any carb advice would be great!

I attached the stock carb specs in a pic.
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AC 90-youth carburetor in cold weather-Colorado-img00715-20120226-2140.jpg  
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Old 02-27-2012, 09:29 PM   #2
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I dont know in what incriments the pilots run, but usually 15% leaner does it. A 35 would be in the park for the pilot. I dont see much change in mine year round, but adjusting both the main and pilot should help a lot.
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Old 02-27-2012, 09:30 PM   #3
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Have you tried adjusting the pms. Usually a quarter turn is enough
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Old 02-28-2012, 07:57 AM   #4
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I have the same cold start problem. I just adjust the idle up about a quarter of a turn and that helps. Then I usually jump on and ride it/warm it up before the little man gets on. Then he is good to go! My son has been ridding all winter.
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Old 02-28-2012, 10:08 AM   #5
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yeah it started out dying on me at first and i would have to keep the throttle on it to warm it up, but if you let it idle even after warm it would die on me. Which in the summer time it cranked right up. Then it got worse and worse and now i can't even start the thing. I took the carb apart, cleaned it, actually put a new pilot jet in, the stock 40, cleaned air filter, exhaust screen. i adjusted the float. But now it wont even start at all, i just dont know where to go now?
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Old 02-28-2012, 10:13 AM   #6
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thanks, i think i will try the 35, however you said to adjust the main too? what would u suggest to adjust it to?

thanks again
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Old 02-28-2012, 10:16 AM   #7
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Your main only controls 3/4 to WOT I don't think it will help your starting issue. Did you clean the starter jet ?
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It's mind over matter,If you don't mind,
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Old 02-28-2012, 12:04 PM   #8
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yeah that is what i was thinking about the main jet. The starter jet? isnt that the pilot jet? sorry i know enough about carbs to be dangerous.
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Old 02-28-2012, 12:19 PM   #9
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Read jetting 101 in the pinned section there are a couple good links with diagrams. Dynojet website also has a troubleshooting guide on their site
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It's mind over matter,If you don't mind,
It just doesn't matter

No Boost No Bottle
just balls and throttle
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Old 02-28-2012, 03:16 PM   #10
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I had a problem earlier when I cleaned the carb and somehow messed up the float. Always seemed like it was starving for gas. So I took it back apart and sure enough the float was not correct. Just a thought. Trail and error, trial and error until you get it right. good luck.
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