just want to do a swap with a minimum of engineering to swap out my carbs with some heated rack type carbs , I have used all kinds of filter material with the same sad results, frozen carb slides . tia M

I am going to go out on a limb here and guess that you have removed the airbox???????
running unifilters maybe ????? or the airbox needs some modification.

Heres the problem, and different carbs arent really going to help the issue.

Its not water in the fuel thats freezing, its not snow dust getting sucked in that is sticking, i have found the cure with nothing but some logic, some cardboard and a roll of duct tape.

This is whats going on and you can verify this yourself, this is what i found to be happening.

the powder snow is hitting the pipes under your hood , melting and turning into steam, that steam is getting sucked into an aluminum throttle body that is pulling cold air in constantly the second that steam goes into the carb it is cooling off and immediatly sticks to the side of the carb.

if your running unifilters you can make a sorta of secondary air vent to try to pull all your air from the clutch side vents

try to block off the airflow from the top and the oil tank side

also i have found when you fill up, pull 4 ounces of apv oil in your gas ,i realize this a super low ratio, but it hardly affects the permormance that thin of a mix and the ice has a bit more hard of a time sticking to the oiled surface of your carb slides.

i took a piece of cardbaord and cut three slots in it to fit down the side of the engine block and kinda nest around the carbs, took another piece and stuffed it down right next to the oil tank, then bent it around the front corner and over the top, taped the shit out it and guess what i rode 400 miles without the carbs sticking on me. i wish i would have taken pictures. i have since put an airbox back in and modified the vent work a bot to pull everything from the pto side vents.

also dont put alchohol or dry gas in your fuel as this only make the freeze ups worse, when alchohol evaporates the temperture around it drops instantly lowering the temp even more.

just try it and let me know how its works out for you it only took me 10 minutes to cobble that vent up, but it did take care of the issue

oh and on other note, dont disconnect your carb safeties , the disc brake doesnt even slow this machine down when it sticks wide open. trust me i had to buy some new underwear after finding this out the hard way.

DanTheMan

I had problems with the carbs icing up, on my EXT600. I got a Black Magic air box, with pre filter for riding in deep snow.
No, problems since, Ive had it on the sled now for 7 years. I do alot of riding in the Keweenaw, pushing snow with the bumper. Plus it's simple removing and installing the carbs. you can have them off in less than 5 minutes. The air box comes with a bracket to reposition, the coils and fuel pump, since they are mounted on the factory air box.

I still have the factory airbox with slp powder screens covering the openings . I like the side vent idea and the B/M airbox top... do they still make those

No. Arcticat never put heated carbs on their sleds. Thats where yamaha had a brain wave. These used them and still. If your worried about freezing up, use isopropyl alcohol in your gas. Or you may have to change youir filters.. Check your breather line for your fuel tank. make sure its not out in the open for show to access. Snow in ='s freezing up.

Here is a possible cause. DEW POINT. Riding you sled at temperatures close to the dew point. Lots of moisture in the air getting crammed into your COLD carbs causes the carbs to frost over. Going slow in the trail, then hit the lake and frost occurs!
Let's say your airbox is 1 cubic foot (for discussion sake) and you are sucking that volume of air into the little 36mm carb openings...the air condenses (I think thats the word) into water....and the colder air from your speed freezes it when you hit the lake.