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on my m931a1 the primary air pressure is 125psi, while the secondary is reading 135psi. i went through the trouble shooting tm's and only found info on what to do incase of overpressure on the primary. and i couldnt find a second governor for the secondary air side, so im assuming it all shares...

i called eastern earlier today to get more information and what they told me was that its a complete kit, bolt on, that increases power 20%-25%. but from reading the past few years threads discussing the possibility of turboing the nhc 250 it sounds like it needs quite a bit of work to the top...

yesterday i bought a 1987 (engine block date is 11/86) M931A1 with 640 miles and 32 hours on the clock. there are a bunch of MWO tags and i found some paper work with what looks like a pm checklist filled out from fort shelby with a date from 1996. so from that im deriving it is original and not...