Fat Boy Torsion Springs - HCS Snowmobile Forums

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Old 02-14-2010, 12:10 PM   #1 (permalink)
Super Advanced Member
Join Date: Nov 2004
Posts: 242
Location: Yorkton, Sask.


For those guys having trouble with spring / idler wheel clearance try part number 7042240-067 and 7042241-067. These are from a 2005 600/800 touring model .405 Dia 77 degree. The spring coil is 1/4" less in width then the RMK edge springs. The inner diameter is also a bit larger. To solve this larger diameter problem you need to get a 10"-12" piece of 1 1/4" ABS pipe and slide it over the existing spring sleeve. This takes up the slack and keeps the spring from twisting over to much under tension. Set on the middle spring adjuster setting the slep pops up to the max height and sags to 4 inches with my 230 pounds on the sled. The long tail on the spring is about 1/4" to 3/8" longer then the rmk springs which you can cut off or leave . I can't see any interferance on my RMK in which they could stab the track which was mentioned in some of the other post I have read.

RMK spring numbers are 7042068-067

There is a spring kit part number available but as to what springs are in the box I have no Idea, I know they are .405's that's all. That number is 2900098
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