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MPI Roller Secondary

Just picked up a roller secondary for my MM. Anyone got a suggestion for helix and spring? It's got PI end dumps, milled head, and 151" track. Running 8cr in the primary with .8g in both holes.

Thanks!

deep
 
I have a '97 M-Max with a very simalar set up. I have a MPI secondary, Challenger 151, Power Inc end dumps, split head gasket and reed spacers.

Secondary: 48/40 with a green spring set at 7.
Primary: 8CR with (2) 10.3 alum.
Gears: 19/40 with 9 tooth anti rachet drivers
 
Yes, very similar then. I believe I have 18/40 on gears though...I think I can get 19/40. I have Northern Lites' D/R chaincase, so I'm somewhat limited on chain length.

Happy with that setup?

Thanks!
 
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