i was thinking of posting a question, but this is basically my question also...slipping clutch. i have an '06, 19cc domes, +4 timing, t-5's,2into1 foam filter,stock carbs with tors removed,v-force 3, vitos superstock pistons, running 100LL av-gas with power plus, i do 3rd gear starts on drags, and get plenty of wheel spin and have bought a 15 tooth front to help but it feels that the clutch is not releasing very well, i run honda hp trans oil 85w. i am thinking i need to do the heavy springs in the clutch also. if i change half of them with heavy ones, how much will it change the "feel" of the lever? how hard are they to change? special tools?