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Thread: 40H carbs?

  1. #11
    Richard Sacher curbman's Avatar
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    Default

    My 40H carbs never had any holes drilled into them, and it ran great.

  2. #12
    Jerry Wienandt
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    Default 40H AJ Carbs

    Should have no holes and should have full butterflies. Contact Aeroliner for butterflies and be carful to align with the beveled edges contacting the venturi wall correctly. LocTite 271 on the screws.

    Contrary to popular belief, butterflies are NOT round. They are elliptical and cut on an angled fixture to get the beveled edge and correct shape.

    The 40H came OEM with partial butterflies that allowed it to idle, but later APBA Safety rules require full buuterflies.

    Later yet, a lanyard a kill switch was required by the Safety rules, belt and suspenders. Even for classic demo running, I recommend a kill switch in the boat. Simple hook-up, one wire to mag terminal post, other wire to ground on mag or engine block.

    Jerry.
    Trident racing

  3. #13
    Jerry Wienandt
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    Default Oops.

    Apparently I need to put my glasses on typing this stuff. Sorry about the typos.

    Getting old IS great, It beats the alternative. And, you can get away with stuff...

    Jerry

  4. #14
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    Can the float with the spring be used in this carb ? Don't think I have seen the float with just a rubbing plare? And if yes what needs to be changed?



    Thanks,Randy

  5. #15
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    Default Holes

    It is my understanding that some of the early KE7's had this hole also, to help with idle quality. Seems like a half a#$ed way to fix a carburetor design issue. I think my KE7 had it too but I put a 8 petal reed cage and larger carb on it years ago. Might have been some kind of clandestine dealer or home remedy upgrade. Who knows?

    kk

  6. #16
    Administrator Aeroliner's Avatar
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    Default 40-H Carb

    I have looked at the carbs on both my 40-H engines. They are AJ33's and they all have the bleed hole. Attached is a copy of the parts manual I have also. Note the hole in the small boss right next to the carb mounting hole.

    Alan
    Attached Images Attached Images  

  7. #17
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    Thanks,Alan! Good to know.

    Just found this carb in my "old Stuff".

    The little one is a AJ32A from a KG7?, the other is a N 2150S for a 20H.
    Man is it big?


  8. #18
    Administrator Aeroliner's Avatar
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    Default Carbs

    The AJ-32 could be used on the KG-4H and the KG-7H. Have a number of the engines with them. The Carter is a very good example of the early 20-H carb which was later replaced by the KA-7A in the conversion days. I have Mercury data going back to 1948 and was a Mercury dealer for 35 years.

    Alan

  9. #19
    Administrator Ron Hill's Avatar
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    Default I'm Confused...

    AJ-32 A carb, replaced the AJ 29 A's on KG-4 and 7's as I recall...

    Great picture of the Mark 40 carbs, does the picture show that bleed hole? The AJ 32A's don't have a bleed hole, right???

    The Carb were much faster than the KA-7A carbs...in smooth water or if you used a neoprene needle and seat (Which was illegal in APBA Stock)..

  10. #20
    Administrator Aeroliner's Avatar
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    Default Aj33

    The manual page I posted shows the bleed hole. I think you might be right on the carbs for early A and B. Back to the manual to check.

    Alan

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