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I am currently running a polaris silver clutch spring with a 45-36 helix. My 1997 xcr 440 will not pull it wants to bogg down when shifting. So I am going to put back in the 50-34 it came with. It pulls the 34 better. I put the 45-36 in hoping to get better milage. But motor will not pull the 36. What spring should I put in. I am not a racer but do trail ride around 30 mph in northern wisconsin. should I put in a polaris blue or just leave in the silver.
 
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