ARTCIT CAT - TORSION HELIX INSTALL
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IMPORTANT - Read the entire instructions before proceeding. If any of it does not make sense or is not in your skillset, please have an experienced technician perform the install.
1 - Remove secondary (Rear) Clutch from the snowmobile.
2 - Using a clutch compression tool remove 4 helix bolts (Torx40). *CONTENTS UNDER SPRING PRESSURE*
3 - Carefully Remove Stock Helix and spring.
4 - Remove all factory plastic washers and thick spacer on the shaft.
5 - Drill l 5/64" hole in clutch halfway between roller and brace in spring groove where the dot is. See Figure l
6 - Remove the end cap from your supplied BMP Helix.
7 - Install the BMP-supplied helix torquing the 4 bolts to 20ft/lbs. each.
8 - Install the spring into the newly drilled hole on the clutch sheave.
9 - Set the end cap on the spring in the proper spring hole, then lightly bolt the cap into place leaving roughly 3/16" gap before seated. This will give you enough room to push down and turn the quick click cap.
10 - Then with BD-50033 tool, or by hand push down and turn clockwise into the recommended hole position.
11 - Tighten 4 Torx 25 bolts to 50 inch/lbs.
12 - Install clutch and belt on the snowmobile.
13 - Adjust belt deflection if necessary. Add washers to tighten, remove washers to loosen.
14 - Add torsion preload to increase backshift (throttle response) rate and peak RPM if necessary.
15 - Decease torsion preload to increase upshift rate and lower peak RPM if necessary.
For best results use Bikeman adjustable weights and primary spring in combination with the torsion kit. If you didn’t purchase the Stage 2 Clutch Kit, use holes 4 or 5 for a starting point. 1100 Turbo & Non-Turbo models will want to remove the white plastic triangular reverse ramp. All other models will leave the white plastic triangular reverse ramps in place.