Join Date: Feb 2003
Location: Saint Lazare, QC.
The driven pulley should have a 504141800 Washer installed on the outside of the cam (helix) before the snap ring is installed (Ski Doo cams have a steel hub) so it doesn't chew up the aluminium EPI cam. A little bit of anti seize or grease should be applied to the inside bore of the new cam. Depending on the spring installed on the driven clutch (Ski Doo Beige) or EPI blue, start spring placement at A5 (C=softest A=intermediate and B=stiffest).Your goal here is to get an average of 19 lbs measured at the outer circumference of the sliding pulley half. With the scale in place pull it until the pulley moves 1" observe scale (eg. 21 lbs), slowly release the pull on the scale until the point at which the pulley rotates back and observe the scale (eg. 17 lbs). Your average is now 19 lbs. Keep in mind tightening the preload will slow down your up-shift and quicken back-shift while loosening preload will quicken up-shift and slow down back-shifting. If your kit didn't come with new TRA ramps, you might want to consider some 417005280 ramps as they really wake up the hole shot on packed snow. The stock 286 ramps are pretty good all around otherwise. If your primary is using an EPI yellow spring (240-320 lbs), set your adjustable pins to 18.2 grams (2 short hex screws). be sure to use OEM buttons in the primary (used ones) are just fine. Lube the sliding parts with Non stick table saw dry lube and make sure you use a new 417300067 Ski Doo belt. Set the pulley distance up with the engine idling and rear end lifted. With distance correct, the track should just start to creep off the ground. I wouldn't bother putting the windage plates back on the secondary either unless ultimate top speed is your goal. The cooling benefits with the plates off pays bigger dividends. Your shooting for 7850 ~ 7950 rpm and no more as power drops off fast on a 670. Set the clickers to # 4 to get a base line. I would also suggest changing your gearing from stock 26 - 44 to 26 - 42 because the 670 loves to be loaded down to optimize it's big flat torque band. Lastly, let your track limiter straps out 1 hole, tighten ski shocks 1 notch before max (depending on your weight I'm 225 with gear on) and hang on !
Located in Western Quebec
Kilos traveled this season 2750