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  • June 25, 2022, 07:48:19 PM

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Author Topic: Macoy Blue head 40 engine  (Read 787 times)

Offline Bootlegger

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Macoy Blue head 40 engine
« on: December 24, 2021, 06:47:52 AM »
 
 Guy's I am looking for a MC Coy Blue Head and I prefer N I B if possible..  Thanks a lot, and Merry CHRISTmas to all
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Gil Causey
AMA# 6964

Offline De Hill

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Re: Macoy Blue head 40 engine
« Reply #1 on: December 31, 2021, 06:19:34 PM »
Blue head Mccoy's were normally R/C engines.
Is that what you want?
De Hill

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Re: Macoy Blue head 40 engine
« Reply #2 on: January 01, 2022, 09:14:27 AM »

 De, I had rather have a C/L engine, didn't  know the difference  obliged to you... :!
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Gil Causey
AMA# 6964

Online Dan McEntee

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Re: Macoy Blue head 40 engine
« Reply #3 on: January 01, 2022, 11:01:51 PM »
De, I had rather have a C/L engine, didn't  know the difference  obliged to you... :!

    The only difference between the Blue Head and Red Head is the Carb and the Blue Head on the R/C version, I do believe. You need to fit a venturi and needle valve to a Blue Head, and then you have a C/L version, but as far as I know, there were no factory made Blue Head C/L versions. The head color was just a marketing thing.
    Type at you later and
     HAPPY NEW YEAR!!
      Dan McEntee
AMA 28784
EAA  1038824
AMA 480405 (American Motorcyclist Association)

Offline Bootlegger

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Re: Macoy Blue head 40 engine
« Reply #4 on: January 02, 2022, 04:53:42 PM »

  Guy's thanks for the info, and a healthy and safe New Year
8th Air Force Veteran
Gil Causey
AMA# 6964

Online MikeyPratt

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Re: Macoy Blue head 40 engine
« Reply #5 on: January 04, 2022, 02:15:57 PM »
The McCoy 40 Blue Head was the same as the other 35 & 40 McCoys with a simple air bleed carburetor and an exhaust baffle that would close with the throttle body of the carb via a link.  Because of the introduction of the Hi-Low K&B fuel of the time, the end of the piston connecting rod was bushed on a few models, but not all of them. 

The bushing helped to reduce the wear on the wrist pin during low throttle operation.  This bushed Conrad would also fit in a Red Head.  For the most part, they were pretty good engines.

Mikey


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