· OCD Sledhead
Mach Z 900R
You are correct. However my situation is abit more unique. PM me if you want more on the direction I am headed dont want to derail.I see people complaining about missing RPM on mach z. Stock primary spring is 417224165 (170-300). Cheapest and easiest fix might be to go with 417224166 spring (170-350). I would definately try that first.