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  1. #1

    Join Date
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    RCMK rear exhaust

    Hi All
    Just purchased a stock standard rcmk rear exhaust
    motor and want to know if any one can tell me some
    Mods for to raise the exhaust port timing
    etc I want this thing to go the best I can the competition
    in my home town NZ is tough

  2. #2
    Ron Olson's Avatar
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    RE: RCMK rear exhaust

    It's almost the same as modding a side exhaust engine with consideration that the top-end is 90 degrees off.
    This article might be of help to you, http://www.modelgasboats.com/rcmk-ss...-modification/
    IMPBA 17238 S
    269 Racing Team

  3. #3

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    RE: RCMK rear exhaust

    I have a stock K30 rear exhaust also...trying to get the best out of it. No mods yet, however it seems to have enough grunt to get to a competitive level. I think with the right prop it can be cometitive in heat racing.

    What type hull are you using?
    River City Racing Club
    IMPBA District 14

  4. #4
    Ron Olson's Avatar
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    RE: RCMK rear exhaust

    I had 2 of the R-254's, still have one yet that's never been fired up. The first one was in a JAE gas 'rigger. The other I'd like to find a good hull for it or sell it, I'm not sure yet.
    IMPBA 17238 S
    269 Racing Team

  5. #5

    Join Date
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    RE: RCMK rear exhaust

    Gizmomotors.com make a top end kit for the K30RZ rear exhaust. Do the upgrade and that K30 will be putting out 7.5hp

  6. #6
    Ron Olson's Avatar
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    RE: RCMK rear exhaust

    I'm thinking that if I hang onto mine it would be a good candidate for a Gas Sport hydro hull, I don't have one of those yet.
    IMPBA 17238 S
    269 Racing Team

  7. #7
    F1madness's Avatar
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    Quote Originally Posted by henschel View Post
    Gizmomotors.com make a top end kit for the K30RZ rear exhaust. Do the upgrade and that K30 will be putting out 7.5hp
    Before purchasing 1 of these K30 RZ topkits modded by gizmo make sure they havnt removed the extra sleeve,i know they do on the SE version
    the older RZ sufffered piston problems
    I run the the K30 rz topkit with only a couple of mods but left the sleeve alone and piston still looks good and plenty of power
    RC Boating enthusiast and designer builder

  8. #8

    Join Date
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    My goodness!!!Boating at Blenheim!! Way back in 1980 -82 i used to race at Picton, around the right hand side of the harbour. Twin Ops 65's in a rigger and a Prather deep V with i forget what.
    Thanks for the memory jog!!


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