I will read through it again and look. Found your set up. Copied and pasted from the air box mod thread. "Yes I am running stock 04 mtn 151 track and 04 mtn stock gearing and stock 04 mtn secondary. I asked Turk about my primary clutching and he said it is basically stock 03 clutching the arms are filled with stock weights and I think my spring is a stock 03 as well. Sorry I cant go look as I am away at work but Turk said my primary is basically stock 03." My question is: Will this set up work on my 03, 136" x 1.75" lug track, not sure of the gearing. I don't know much about clutching and I am wondering how I go about finding the best clutching for my set up. Does the max rpm at wot come into play anywhere.