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I am new to snowmobiling and am pleased to find such an informative sight that I can ask all my "rookie" questions on, so here goes the first of many concerning the 04 REV Summit 800 I recently purchased. What exactly is a carb heater and when should I be running it??
 

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Skidoo tech says forget what the manual says and only use the carb heaters below -0 deg. and then only IF there is carb iceing.
 

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Dont use it unless your carbs are icing up as the machine will be hard to start when in use...They are a good option though when you need them..
 

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hmmm. Left mine on all year cause the manual says to up to 40F. And it was always hard to start warm, always able to start but not like I think it should.
Except when I left it on and rode in 45F. Wouldnt start till I shut the heater off.
Guess I'll try running it off for a while and see if it starts easier.
So others have had the same issues?
 

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adrenaline said:
hmmm. Left mine on all year cause the manual says to up to 40F. And it was always hard to start warm, always able to start but not like I think it should.
Except when I left it on and rode in 45F. Wouldnt start till I shut the heater off.
Guess I'll try running it off for a while and see if it starts easier.
So others have had the same issues?
Rotax engines of recent years have all been hard to start when warm - just the way they are. Give it a little gas when you pull it and don't be surprised to have to pull more than once.
 

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If you leave carb heat on it will boil the gas in the carbs & cause a vapor lock that
will make the sled impossible to start until it cools. Happened to me a couple of times until I figured it out. Only use when below 0 deg. & turn off before you start making some hard pulls & getting the motor hot.
 

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Used mine twice, in really cold conditions, and I shouldn't have. Just about impossibe to start. Had to load it on the trailer with 3 guys. That sucks, it's a brand new 2004 sled with less than 200 miles. Big John says don't use it unless your carbs are blocks of ice. I believe him.
 

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As I don't ride in the extreme low temps, I disconnected the hoses on mine. Makes it a ton easier to change main jets and doo float bowl work. I can turn them upside down, so all the fuel doesn't spill out. No more 'pull it 100x' to fill the bowls back up...

 

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Used when cold temperatures and water in gas (unlikely) or drawing in snow dust when following another sled (more likely), but since I have a prefilter sock on air intake I haven't experienced iced carbs. Therefore, since the Doos are really, really hard to start when warm, I would use them as a last resort.
 
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