I don't know for sure but it seems to me when using a shift assist it works great at lower speeds but at higher shift stages all it does is help the secondary spring downshift restricting maximum track speed. I think the orange spring has to much pressure to get the best track speed. I say this because my sled rips off bottom but about the time it slows in upshift it then starts to down shift and pull rpm's down. I have also never been over 85mph on the trail (i know trail riding doesn't matter) but my primary is shifting out all the way, and not my secondary, and by doing so it is twisting my motor back before it will shift the secondary all the way out, it has also walked the belt over the primary, my track speed while climbing is also not as high as it should be. I either have a messed up secondary ( I have tried others though) or the spring is to stiff, or without the shift assist it lets it hold its shift point better rather than trying to back shift immediately. It has also destroyed motor mounts. I am running less clutch weight then other sleds as well. So is the shift assist a good thing, I think it is for boonedocking and lower speeds, but after that I think it can become a bad thing. Or what is my problem. The clutching worked great stock, but it has never been as good with mods and the shift assist. My belief is the orange spring works great on a stocker because in stock form the sled doesn't have the power to get into those stages of the secondary spring where it becomes to much. There is another m1000 like mine without a shift assist that pulls away, the one time It didn't I had the motor nearly mounted solid with a custom mount, which was way to stiff but proved my point that the clutching was causing a bind. On climbs the track speed goes to the same speed no matter the rpm but wont climb higher, almost like it locks up in gear until you let off.
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