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Dear Ralph: I have a 2003 Arctic Cat 900 Mountain Cat and have a problem with the throttle sticking. I’ve checked the cables and...

Dear Ralph:
I have a 2003 Arctic Cat 900 Mountain Cat and have a problem with the throttle sticking. I’ve checked the cables and the splitter box, but they seem to be fine. The only thing I can think of is that the carbs are freezing up.
Christopher Peacock
Kitimat, BC

It sounds like you’re confident you’ve eliminated any mechanical interference or reason for this to be occurring. I would tend to agree that you’re dealing with a water ingestion issue and the slides are physically sticking due to ice.

A couple of thoughts. Arctic Cat did add the heated feature to the carbs for 2004, likely in response to situations like this where their riders were tired of the sleds quitting once the electronic safety system detected the slides were not returning to the closed position (the ECU compares the position of the carb slides to the throttle lever and cuts ignition if they don’t match).

Being you’re riding in and around BC on a Mountain Cat indicates you’re riding in deep snow, and deep powder gets sucked into the airbox and carbs. I believe your airbox has a pre-filter on the backside under the hood, but the primary intake tract does not have an actual pre-filter other than the coarse foam one. You need to install one of the actual Outerwears pre-filters in your intake, which does not allow water molecules to pass (think of Gore-Tex in reverse). This is the same material found on the new M-Series mountain sleds, and I consider this to be a “must-have” item on all of our mountain sleds, regardless of brand. We use them on just about every sled we have, mountain or trail, because of the difference it makes in eliminating snow ingestion and carb icing issues. Order part #14-207 from Starting Line (208-529-0244) for $27.95 (for a set of two). They also offer this material in bulk for custom installs.

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