Coolant Valve for Carbs ?? Clueless

M

Morley

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Nov 8, 2004
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Canada - Above you
Ok dumb question, My 97 sx never had this on the carbs, but my new 2000 SXr has a valve to control coolant to the carbs.
Should this be open all the time, or only sometimes? Need some experience on this, since I have never owned a sled with this.

I only realized when I took the carbs off the other day that this was even there.. lol
 
All I now is that you canopen it when it gets really cold outside...I never open mine but I guees is good to open it once ina while to have things moving......Somebody else might heklp you a little bit more......Good luck with that nice sled.....Also on the tech pages there is a hole section for sxr.....You should be a ble to play with it a little bit....If you want....
 
it really depends on how cold it is outside. I leave mine open for 90% of the time and only close it toward the end of snowmobiling season whe the tempurature is much warmer.
It will keep the carbs from freezing.
 
My VMax does not have them either. My Dad's Viper does though and if he turns it on even when it is real cold it does next to nothing. They plumb the carbs to help with icing but it is not really needed. Best to leave it off till you notice an issue with powder in the air freezing in the venturi. (pressure drop in the venturi can cause icing if enough moisture is in the air.)
 
Morley, unless it's 20 below F. I wouldnt mess with them The last time I used mine was 3 years ago when I shut my sled off for an hour I tried to restart and the carb's were a block of ice. It's like the heaters make condensation then when you stop they freeze. But they wont freeze on the trail when it's really cold. I just open mine up every now and then to make sure it dosent seize up. ;)!
 
my srx has the same thing i can turn it off and on.. i always thought it was a fuel rail wow i just learnt something today:) so you guys are saying to keep it off and it wont break anything now will it?
 
Guys,

Correct if i'm wrong,
but i have information that this should be open only, when conditions are around 35F. Humidity is high and that might generate ice in your carbs.

With cold weather there is no reason to keep it on.
 
7,000 mi. - valve off - no problems

I have 7,000 miles on my '99 SX 600 triple with this feature and I have never turned it on or had a problem with icing in any weather conditions. Leaving it off will not hurt anything.
Mills
 
Cold weather and powder snow injestion can freeze your carbs. Running them on all the time there is a noticable power loss if it gets too warm. I run with it off and if it starts to run rough at slow speeds when cold I'll turn the heater on.
 
the only time i had to use mine on my msrx was last year on a trip when it was -20F out and a bunch of snow under my hood. Carbs froze up, turned the harb heaters on and was back to normal. that is the only time i have ever used them and does not hurt anything when the valve is closed.
 
Blue by U said:
reimond, reverse that. below freezeing turn on. its to keep the moisture from iceing in the carbs.
Click to expand...

Hmm.. Butbut..

When it's really cold = no moisture?
In my knowledge moisture is highest around 35F and when air is sucked in carbs it will cool down and create ice?

Reimond.
 
flying snow in to your hood and your airbox turns to water when ingested then mist refreezes in the carbs in belowzero temps then turns your jets and slides into popcicles. So it's not really the humidity in the air thats causing the problems it's the snow we ride on.
 
Yamaha had problems with the carbs on 96 and 97s freezing. I believe it was the pilot jets freezing. This was the corrrection for this, not sure how good it works, but it is supposed to heat the carbs in very cold weather and keep them from freezing. You are not suposed to have them on above a certan temp. I had the carbs on my 97 freeze on me in Canada, and a friend was riding a 98 and had the heaters on and he had no problems.
 
at what temp are you not supposed to have it on anymore? last winter i rided with mine on every ride.. this might explain loss in power
 
the carb heaters work very well when they are needed. The loss of power comes from the coolant that is running through the carbs heats up the intake charge making the air less dense thus making the mixture richer.
 
ovalracer said:
the carb heaters work very well when they are needed. The loss of power comes from the coolant that is running through the carbs heats up the intake charge making the air less dense thus making the mixture richer.
Click to expand...


ok thanks so lets say up to -10 to -15 degrees i keep the cooler off?
 
FuzzButt said:
My VMax does not have them either. My Dad's Viper does though and if he turns it on even when it is real cold it does next to nothing. They plumb the carbs to help with icing but it is not really needed. Best to leave it off till you notice an issue with powder in the air freezing in the venturi. (pressure drop in the venturi can cause icing if enough moisture is in the air.)
Click to expand...

I agree with Butt......
 
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