[Cambrady]

Hi all,
I have a 21 cforce 400 and have been trying to squeeze all the low end power I can out of it. I've got a clutch kit that helped alot and was wondering what all the secondary positions are. It's at B4 right now. I've also tried B1, and B2 as well. But I don't know what ones will give top end versus bottom end. I don't really care about top speed. Can't afford a bigger machine right now so I gotta make due with what I got and try to get all the power out of it I can.

[NMKawierider]

Hi all,
I have a 21 cforce 400 and have been trying to squeeze all the low end power I can out of it. I've got a clutch kit that helped alot and was wondering what all the secondary positions are. It's at B4 right now. I've also tried B1, and B2 as well. But I don't know what ones will give top end versus bottom end. I don't really care about top speed. Can't afford a bigger machine right now so I gotta make due with what I got and try to get all the power out of it I can.

Being a 400 you are very limited on position you can really use as is with any engine, there is only so much there. The goal is to have the engine run at or just under its best power band as possible. These springs, whether on the primary or secondary, offer resistance to certain aspects of operation such as loading and torque needs. The secondary's primary purpose to balance the load and torque needs to the primary. B2 is too far for the 5 and 600s for trail riding so yours at B4 is way too far and may not start shifting out until over 4K. If it were mine it wouldn't go over C1 which is ideal for all the 5 and 600s. Likely fine for the 400s. The letter and number combinations and the amount of preload you will place on the coil spring at assembly. The image below outlines the preloads in degrees for easier understanding. The more preload the more resistance...and that means the more force the flyweights have to generate to overcome that resistance...which takes more RPMs and power. Your 400 is never going to run like an 600 or an 800+ so find the right balance for. C1 might be slightly over the line...maybe not...but I wouldn't go any farther then that with it unless I was in thick, deep mud all the time. Then I might go to B2 but that's about it. JMO. Good luck.