10 series all have the same shift surface profile and vary by gram weight. Mod tail weight? Do you mean say a 10-62m? That just means the heel is cut to let the weight sit lower in the clutch for higher engagement, the shift profile is still the same. No experience with s weight series, but I think they came from the ATV line.
A forum community dedicated to snowmobile owners and enthusiasts. Come join the discussion about performance, trails, riding tips, modifications, classifieds, accessories, troubleshooting, maintenance, and more!