Primary spring/engagement ?

[fishx65]

New Comet 108EXP on a 95 V-max 500. Silver spring engages at 3200 rpm(to low!). Stock is around 3700 rpm. Comet lists 3 different springs that will get me to 4,000 rpm with my AC-1 weights but how do I know which one will work best?
What else does the primary spring effect besides engagement rpm?

I can list specs of each spring if it helps.

Thanks, FishX

 

[yamaholic22]

The primary spring affects the entire shift out. If you liked the top end rpm of your old spring but the engagement was too low, then get a spring with a higher initial preload but the same total force. That will make the engagement higher, but will behave basically the same through the rest of the shift.