I have a 650 2003 praire W/ pro-cuircut exhaust, twin air filter, diamond G snorkel ,27 " ITP 589's & a dyno jet kit, What do i need for the clutch to get more preformance?

 

1) Get a tach- Do a few test runs and see where your rpms are hanging at. Those big tires are robbing you from your peak power. Shoot for around 6500 rpm.

2) Drop some weight on the clutch - Some of us are drilling holes in the primary face plate or the spider even (caution). The easiest way is to get lighter weights. However, the trick is knowing what weight to use. You can't tell unless you try a set and experiment. This makes adjustable clutch weights ideal.

3) Primary spring shims - You can use these to bump up the engagement rpm.

4) New primary spring - You can experiment with different primary springs to change the engagement and also backshift rate. The higher the preload pressure the higher the engagement rpm. Very few like the engagement shock, that some springs provide, for general riding though. They are better for competition IMO.


Do a search on these topics and you'll find more.