celicaguy58

its below 0 here in minnesota today. i was riding out on the lake and i thought i could hear some missfiring or a slight pop as i was riding 1/4 throttle slowing down. maybe i only herd it because i was paranoid and knew that the cold temps would make it run leaner. im pretty sure that it has its stock jets in it. the plugs where jsut slightly lighter than color of cardboard. usually they are cholotale brown with tan tips at the very end. should i wait till it warms up or can i ride it without worrying?

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'94 Arctic Cat EXT 580

NLBurden

Running sleds at 0 is great, i ride in all tempatures as long as it isnt below -20 because then i'd worry about myself freezing :P

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I Love To Be Loud!

Ditch hopper

snowmobiles are ment to run in the cold why would they desgin a sled to run at +4"donest snow when its warm" you will not lean it out in 0 bout -15 celius

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Real men Hijack threads

-1995 zr580- aaen pipe, epi clutch kit, camoplast ripsaw/120studs, 3inch riser, flybars, upgraded foxshocks, weisco pistons, lightly ported, 19tooth top 32thooth bottom soon to come bored carbs, plastic skis, new helix and ramps BRAAAP

-1994 indy trail 500- all stock, great on gas

celicaguy58

thats good to hear. i guess i was just being cautious.

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'94 Arctic Cat EXT 580

Ditch hopper

If your really worryed mix your gas 40:1 if plugs go black 50:1

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Real men Hijack threads

-1995 zr580- aaen pipe, epi clutch kit, camoplast ripsaw/120studs, 3inch riser, flybars, upgraded foxshocks, weisco pistons, lightly ported, 19tooth top 32thooth bottom soon to come bored carbs, plastic skis, new helix and ramps BRAAAP

-1994 indy trail 500- all stock, great on gas

celicaguy58

im worried about oil. just if im lean on the gas.

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'94 Arctic Cat EXT 580

Ditch hopper

how could you be lean on gas lean =more gas than oil rich= more oil than gas if your worryed about leaning it out run premix and diconnect your oil tank for the time being!

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Real men Hijack threads

-1995 zr580- aaen pipe, epi clutch kit, camoplast ripsaw/120studs, 3inch riser, flybars, upgraded foxshocks, weisco pistons, lightly ported, 19tooth top 32thooth bottom soon to come bored carbs, plastic skis, new helix and ramps BRAAAP

-1994 indy trail 500- all stock, great on gas

99xc600

Lean means too much air for the amount of fuel. You can burn an engine down at 20:1 . If you have enough air to ignite 100% of the fuel in engine, then engine has no oil left to lubricate and....BOOM! More oil will maybe help for a minute, not in the long run. That is why temperature plays a facture in burning down an engine. Cold air is more dense and thus has more oxygen, more oxygen burns more fuel. Stock jets should be good to 25 below without a problem, but with downsized it become more risky.

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99XC600
98XTC700
00SXR700
01XC340

JDS

You need to know what jets you have in your carbs. Cats have a jetting chart on them that shows what jets to run at what temp and altitude. That chart is a good guideline, but reading your plugs gives you a more accurate picture of what jets you should be running. I've run my ZR down to -20 no problem using the jets on the chart. I run my EXT at 2 sizes lower than the chart, and it's been fine for over 4,000miles. I keep a logbook showing what jets work best at different temps and altitudes as well as clutch weight sizes, clutch spring colors, etc.

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JD
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2001 Arctic Cat ZR500
2003 Polaris Trail RMK 550F(wife's)
1991 Arctic Cat EXT SP 550
1991 Honda Fourtrax

kccats

2 Things to do, increase the main jet one size and raise the needle(lower E clip)!
They do make a controller that you can adjust the flow rate! Holtz makes the veri flow!

lrnnorth

I run my sleds at -30C witch is around -20F to -25F. Anything colder than that and its just miserable to ride anyway. Rejet if you need to and youll be fine.

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01 Polaris RMK 136"
- 01 600 VES Engine - Uni Air Filters
- Sno Stuff Rumble Pack - Powermadd Boost Bottle
- Custom Painted Hood - Powermadd Bar Riser
- EPI Pro Series Clutch Kit - Xtra-10 rear suspension
01 Yamaha VK III 540 (The TANK)
Out Of Commission Till Next Year

eriksat1

Find a temperature / altitude / jet chart for your sleds engine. From -30 to 0 mine takes a .280

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I didn't claw my way to the top of the food chain to eat vegetables!
1980 John Deere LiquiFire
1990 Polaris Indy 500
1993 Polaris Indy Trail
1996 Arctic Cat 340 Puma

ethan31

This is a good read for jetting in general and will help with what you need to do......

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