Hey, haven?t been on here in prob 7 years or so. Here?s my dilemma; I just bought a used 07? 700, it has 27? mudlites. The seller told me that it had a Yamaha Oem heavy secondary spring installed because of the big tires but as far as I know no other clutch mods. It is very gutless on take off, feels more like it has 30? tires on... I?m comparing it to my 08? 700 with 27? outlaws before I had the primary machined. This thing will barely get moving unless you really lean into the throttle, wheelies are out of the question. So... I was doing a bunch of work on it, had the belt cover off, the secondary spring is orange ( like I said apparently a factory Yamaha part off of some other machine?s part listing ) it was really dirty in there so I serviced the primary rollers, replaced the belt and put a 1mm shim in. Didn?t seem to make any difference at all. Mudlites are lighter than outlaws and this thing seems to have way less power than the 08? I used to have. Long story short, I believe the secondary spring shouldn?t really affect my take off ratio right? It only affects the rate at which it back shifts... 1mm shim mod did drop the belt down a bit in primary, but didn?t seem to help power at all on take off. From past experience a machine primary made a fairly big difference after putting 27? outlaws on. Maybe I?ll have to do that again. My question to you guys is do you think there could be anything else wrong? Clutch side primary sheave had a lip at the bottom of belt travel so that belt wasn?t riding flat against sheave right at the bottom, is my sheave worn out? Any help is much appreciated, thanks!