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nathaniel11
Member
i have a 2007 summit 800 and was just wondering what people think about running with the carb heaters on or off?
carb heaters
- Thread starter nathaniel11
- Start date
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Impatientforsnow
Well-known member
OFF... unless its froze up..
I froze up on New Years Eve day. 6 degrees and deep powder. My sled was cutting out, so I just assumed it was getting choked out by all the fresh powder or fouled a plug. I turned on the heater valve and within 5 minutes she was running strong again. I'm going to make a habit of turning it on when temps dip below 20 degrees or so. Especially in the deep stuff.
Choked Out
I rode this past weekend in light powder, 5 above to 5 below - sled would choke out in midrange. Turned on carb heaters and sled ran great! No issues after that.
I rode this past weekend in light powder, 5 above to 5 below - sled would choke out in midrange. Turned on carb heaters and sled ran great! No issues after that.
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nathaniel11
Member
thanks guys alot of good opinions
I believe there is a recommended temp range in the manual for turning it on. It isn't all that cold but there is apparently a lot of moisture in the air at that particular temp range as I recall.
I have never had to use it.
I have never had to use it.
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nathaniel11
Member
yeah i would have looked in my manual but I dont have one. I bought it from a rental place. Ive been looking on ebay for somebody selling one but havent had any luck. So if you know of somebody wanting to sell a manual for 07 summit 800 let me kno.
Thanks
carburetor ice is a rather fickle thing. It can occur at temps up to 80 degrees F. It is unlikley to occur at very cold temperatures due to the lack of available moisture in the air. I would say that it is most likely between 20 and 40 degrees with 100% humidity. I use carb heat in my airplane only as needed because anything that heats intake air will reduce performance. In the airplane carb heat causes the engine to run very rich and loses about 150 rpms. My advice is to watch for the symptoms above, bogging, engine quitting when it should idle, etc and use the heat as needed to thaw it out.
I will be the one to venture away from the group here.
The only time to date that I have used mine on my '02 is when it was -30*. Wouldn't dream of idling and the slow stuff wasn't much better - and at -30* there realy aint much fast stuff eh?
Turned on the heat and in less than a minute all was fine.
Per the "available moisure at low temps" - I think that when we go and stir up the powder and pour some on our intakes and some on our pipes that what makes sence for planes aint exactly applicable to the snowmachine. ???
The only time to date that I have used mine on my '02 is when it was -30*. Wouldn't dream of idling and the slow stuff wasn't much better - and at -30* there realy aint much fast stuff eh?
Turned on the heat and in less than a minute all was fine.
Per the "available moisure at low temps" - I think that when we go and stir up the powder and pour some on our intakes and some on our pipes that what makes sence for planes aint exactly applicable to the snowmachine. ???
I believe the manual specs. say 40 degrees or below. You can download a free manual at skidoo.com. Just click on sleds and choose operator's guide and you're off to the races. Good Luck!!!
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nathaniel11
Member
I believe the manual specs. say 40 degrees or below. You can download a free manual at skidoo.com. Just click on sleds and choose operator's guide and you're off to the races. Good Luck!!!
Where on skidoo should i look to download a manual?
http://www.ski-doo.com/en-US/Operators.Guide.htm
Above site will get you closer.
click on GO
click on 2007
click on Summit Rev 2007
click on ENG-1 Operator guide
select download or save to disk
That's as simple as I can make it. Good Luck
Above site will get you closer.
click on GO
click on 2007
click on Summit Rev 2007
click on ENG-1 Operator guide
select download or save to disk
That's as simple as I can make it. Good Luck
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AKboondocker
Well-known member
I usually need mine when I ride anything around zero or below. Sled runs great and never ices up for me above 10 or so. Its amazing though, that my ski doo with carb heaters is the only sled Ive ever really had throttles sticking and engines cutting out due to icing. On my old Polaris sleds without the carb heaters I would dump a bottle of heat in and go. These sleds dont seem to respond well to that and still ice up badly in the cold. The carb heaters do work after awhile, and then I usually just leave it slightly cracked open or half way sometimes for the rest of the ride to keep it from happening again without running it full on all day. Seems to work for me.
BRP SAYS "TURN OFF VALVE AFTER TEMP RISES ABOVE 41 DEGREES F"
Hope this helps. It definitly doesnt hurt to leave it on.
i have it on in deep pow/cold temps
I am also a pilot and in a plane you wouldn't expect to get it when it's real cold. But as OX said a sled is not a plane and with all the snow and powder melting on the engine it can produce high humidity that can then refreeze in the carbs. The only time I seem to need it is when it real cold.
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snowcross338
Active member
Leave it off till she frezzes up and then as soon as it runs good again turn it back off, it makes the fuel too warm to atomize correctly otherwise. Had one experience with bogging with it on in 30 below weather and haven't used it since.
i agree that the steam from melting snow could raise the humidity near the air intake on any snowmobile and that could cause icing at lower temps than would normally be expected. one might also be ingesting the fine powder snow and plugging up some air passages---not true icing, but same result and same cure. the only time i have seen carb ice on a snowmobile was on a phazer that we installed a fresh air kit on. With an air cooled engine you had to shut it off or leave it alone after it died and let the engine heat defrost it. If you kept trying to start it you would move enough cool air through the carbs to keep it frozen. had some bad days with that sled.