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  1. Jayco36REQS

    Basic Mods For The M939 Series With The NHC 250 Engine...

    I did all my mods with the pump on the engine while sitting on the drivers side front tire. lol I have a magnetic tray for holding small parts and screws. Just have a handful of clean rags/paper towels, starter fluid (for cleaning any parts), and the few tools you need. Piece of cake! :-D btw...
  2. Jayco36REQS

    Basic Mods For The M939 Series With The NHC 250 Engine...

    "Pilling the pump"... sorry that's slang for putting a smaller fuel button in the PT pump. The smaller the number, the more fuel that is allowed to flow to the engine from the pump. Turning the screw will only get you so far unless you change the fuel button as well. I dropped from a stock 32 in...
  3. Jayco36REQS

    Basic Mods For The M939 Series With The NHC 250 Engine...

    Add a 2nd fuel line to the back of the motor, turn the fuel screw a tad, shim and pill the pump.... made a nice difference on my 923A1. Smoother idle, easier starts, and runs 68 all day long.
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