Performance in cold weather?

F

fishx65

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Jan 7, 2006
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Lets say 10 degrees and lower. Mine was a little slower on the low-end last weekend in the sub-zero temps. Does this sound right?
 
Once it's warm, it should actualy run better in colder weather because the colder the weather the leaner it runs, unless of course its running too lean that spells problems, but with normal jetting, you shouldnt have that problem. My sled ran strong last weekend in temps ranging from -5 to 4 above.
 
hoffam19 said:
Once it's warm, it should actualy run better in colder weather because the colder the weather the leaner it runs, unless of course its running too lean that spells problems, but with normal jetting, you shouldnt have that problem. My sled ran strong last weekend in temps ranging from -5 to 4 above.
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EXACTLY.


unless you have it jetted perectly for "normal" temps, it should be this way..

Even if it isn't, it will run really well until it leans out too much, then siezes.

was your inlet clogged with ice? snow??
 
I was taught many many moons ago in automotive school that cold air made more power due to the higher density which meant more air charge in the cylinder making more hosrepower.
Would not a two stroke do the same thing or are they that much different than a four stroke?
My old 68 Chevelle with a built 327 ran alot harder when the temps were 60f and lower.Very crisp throttle response too.
 
stein700sx said:
I was taught many many moons ago in automotive school that cold air made more power due to the higher density which meant more air charge in the cylinder making more hosrepower.
Would not a two stroke do the same thing or are they that much different than a four stroke?
My old 68 Chevelle with a built 327 ran alot harder when the temps were 60f and lower.Very crisp throttle response too.
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Same concept.. 4 stroke, 2 stroke, rotary, whatever allare internal combustion motors so the concept applies
 
Yep cold air should make more power than warm. It is probably in his jetting I'm guessing or something. I've ridden a sled that was jetted for colder than the daytime temp was. When it started cooling off a bunch towards dark, you could feel and tell the difference in the power.
 
Colder air requires more fuel than warmer air

Soo, colder=leaner=more power= the correct fuel/air ratio?(14.5:1)
Does this mean my sled is set to run for colder weather (-15f or so)?
And at warmer temps it is running rich?
 
Most sleds come from the factory jetted to run at -15, -20 F to protect them from warranty claims. So yes at warmer temps it will be running richer.
 
sxr70001 said:
Most sleds come from the factory jetted to run at -15, -20 F to protect them from warranty claims. So yes at warmer temps it will be running richer.
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yep, unless you have EFI, smart carbs, DPM, or Holtzman products that automatically adjust jetting for temp or altitude.
 
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