I have my 14 m8 with 3200kms and was going to replace my stock primary spring as it's showing signs of wear should I replace it with a stock one or is there a better replacement ?
If you were happy with the performance, and were pulling proper RPM for 3200 kms, I would suggest replacing with a spring that has the same finish rate; or very close. Gotta be careful when changing parts in your clutches as for every zin there is a zang in the black magic of clutching.
I'm trying the Cat Green 100/305 right now, and a tiny bit more weight than I have been running; to offset the little higher finish rate than the Cat yellow/green 114/268 spring I have ran in my ProClimbs since 2012.