Hi Raul, I'll try to help.
CT pipe eh.......
Why are you going to 51mm and WHY a Weisco piston??
(50.5 is first bore and get a Zuki piston)
Rear clutch shoes: You take the weight off the end. I cut the end off. You'll cut off about 3/8 inch from the contact pad.
You are not going to produce enough power (compared to a race motor) thus you will not need springs and springs alone won't work w/o major modification.
You may need a different torque spring, but we'll see.
2000 GNC 5N\
2001 GNC 9N \ 40+ class
2004 GNC 9N /
2014 rock crusher "GO tortoise GO!"
2016 Byrd Rooster
Father of the "11" time National champion,and worlds fastest woman ATV racer
A few fast LT80's
250R~300cc's
300ex
350 Rancher
Kymco Mongoose
Survivor of the 12 Hours of ATV America 04 and 05