Primary clutch spring help

I have a 01 Summit 800 144x2 with no prior history on it. I decided to take the clutches apart and replace springs/wore out parts. The secondary is a Team with a red/black stripe spring. The primary i can't figure out, possibly seen a spec of green and then can kind of tell were a stripe was on the spring...maybe pink. I'm confused now though because its free length is 5". My spec book says stock should be a VI/YL spring with free length of 6.217".

What should i replace the spring with? Engagement was 3900 ish RPM before, id like to raise that up to 4200 maybe. I would replace with stock color spring but being i have an aftermarket secondary im thinking maybe i should have something different in the primary.


Thanks,
Matt

I understand the first numbers determines your engagement but i'm not confident on the second numbers. From doing my own google searches i've read that a green/white spring from a 02 mxz 600 works good and that 230/350 is a good spring that give me roughly a 4200 engagement.

You say 160/320...would that not give me a extremely low engagement? Id like to stick with the weights that are in there.