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Well, the 2003 F7's were the fastest, and slowed a little with the change to the Diamond Drive in 2004. They are better, and in 2005 were fine. Don't go after an 03 F7 because there were many recalls. I'm not sure about the chain case.
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My Family's Snowmobiles: 
2006 Arctic Cat Crossfire 600 EFI 136" MINE!
1999 Ski-Doo Mach 1 Triple 700
2002 Polaris Edge X 800
2001 Arctic Cat ZR 600 EFI
1989 Yamaha SRV 540
1972 Arctic Cat Cheetah 340
My club, the Woodford Snobusters!
www.snobusters.com
TRAIL STATUS: Good to Excellent
2009-2010 Mileage: 1,224
5 foot base depths and mid-40's temps makes for great riding!
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