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No other mods. Just a 21t gear up stock 37t down, stock chain, i don't play with weight or spring either. I have acces to 120-320 spring, i was wondering if it worth the try!! I was thinking my 10-70 kill my rpm so i return to 66'.. still 7900-8000 max..

I'm at sea level!, i got an 120-320 to try. The problem is that i'm not doing more than 7900rpm since gear..i'm on loose snow tho... that why i was suspecting the spring (maybe belt too)!what do you think?

Brock, what the best spring would you consider with the gear and weight above? i've done 1.76 ratio and 70''gram weight(i know it's not the Ideal ratio but i was having a 21tooth available to try so i gave it a shot) i also have a bpwr trail can, 1.356 studded to death by the previous owner...