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Ice scratchers help cool the sled when in marginal trail conditions. They work by scratching the snow or ice, throwing up ice chips that can hit the heat exchangers. For deep lug mountain tracks, they are very necessary for cooling and for keeping the hyfax lubricated with melting snow. If you have a short lug track, they are not as important.
The ones above have the advantage of not breaking or bending if you back up. I have 'em on a couple of my sleds and so far, they work as advertised. Temps go down considerably, from 180 to 140 in about a mile of riding after you put the scratchers down.
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2007 RMK 700 155", 2008 RMK 600 155", 2006 RMK 600 144", 95 Prowler 550 2-up, 1990 Indy 650
RIP, destroyed by fire 1-22-2008 
04 RMK 800, 05 RMK 600, 02 RMK 800, 97 RMK 700
http://www.avalanche.org/accidents.php
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