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Thread: My piston wash

  1. #1

    My piston wash

    Here is the piston wash from my boats maiden voyage. IMO, the PTO looks good, and the CENTER & MAG look a little on the fat side. I turned in the MAG main jet 1/4 turn and the CENTER main jet a 1/8 turn.

    What do you guys think?

    PTO:


    CENTER:


    MAG:


    Plugs (from rear to front; not the greatest pic):


  2. #2
    Moderator beerdart's Avatar
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    Looks safe sometimes it takes some more time to get the hole picture. For now it looks good.

  3. #3
    AWA Member 32DegH2O's Avatar
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    How much time do these have on them again?

  4. #4
    def safe!!

  5. #5
    ph2ocraft's Avatar
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    I'd try 1/16 and 1/8, if it's still too rich then go the last 1/16 and 1/8 turn.
    Nice job!!

  6. #6
    That was roughly 1/2 hour of riding. Mostly it was moderate throttle but a few WOT runs. Like I mentioned in my other thread, it ran real strong. I guess I'll put some more hours on it and recheck.

    So Beer, when are we doing some riding?

  7. #7
    *Just a quick update*

    Me and Beerdart went riding yesterday and put some serious miles on our boats; this was the first time I've ever had to switch fuel over to reserve from a full tank. The boats ran fantastic all day. That GPR pulls hard! I was able to get some numbers... 52.5MPH out of my little 750. If it was on a smoother surface I'm sure I could break 53. With a smoother plate, maybe even a little more.

    Mods:
    • 0.75mm bored 750 cylinders
    • Sharp's Marine recreaction porting
    • cut heads
    • F/A
    • Fuel system upgrade
    • Extended pump with 4* wedge & 15/20 prop
    • O/P ride plate
    • Stock grate
    • No sponsons, but need them bad.
    • UMI Steering
    All in all, I'm very happy with it.

  8. #8
    ph2ocraft's Avatar
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    Nice SC, the sponsons will sure feel better for straight line tracking and cornering. Did you check your wash after the long ride and did you make any changes?

  9. #9
    I pulled the heads after my second run out on the new engine (not pictured) and everything still looked good. I fattened them up just a tad to be safe; better rich than lean. After work today I'll pull the heads for another inspection and if it checks out I think it'll be ready for just add fuel and ride. It is definitely a very healthy & stout setup for this boat.

  10. #10
    ph2ocraft's Avatar
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    Richer is safer, especially if you don't lose RPM's.

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