I ordered my black epi spring today for the secondary, for the front they suggested the pink or maroon, they really couldnt explain why they (pink/maroon) would be better so I skipped it. Pink is stock engagement and maroon is 5% higher.

I dont want a higher engagement, so why would I change the front?

 

Plainsman, I put the pink spring on my P650 and it helped it as much as the dynatek CDI did. You don't get a higher engagement with the pink spring, but after the rpm point where the pink spring or stock spring would engage, then the pink starts pulling much better. I like mine and could tell an immediate difference on the first takeoff.

At 1.25", stock spring is at 105 lbs, pink is at 161 lbs. They are both zero at 2.5".

 

Thank you, good explanation.