64 Johnson 5.5hp carb needles

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jerryswiss
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64 Johnson 5.5hp carb needles

Postby jerryswiss » Tue Feb 13, 2018 1:30 pm

This is a Johnson CD21A
It has an adjustable low speed carb needle above the throat of the carb, but no hole in the hood to access it. And a brass plug screwed in to the bowl of the carb, where the high speed needle should go. This plug sticks out of the body of the outboard just below the hood and there are marking on the body showing how to adjust a needle lean or rich, but like I say there is no needle, just a plug.

Question:
Is there supposed to be a high speed needle on this motor?
Why is there no access hole in the hood for the slow speed needle?
:?:

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Chinewalker
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Re: 64 Johnson 5.5hp carb needles

Postby Chinewalker » Tue Feb 13, 2018 3:21 pm

No, there isn't a high speed needle. However, the shaft from the plug is used to support a plastic adjustment knob, with related linkage, that attaches to the low speed needle valve. The plastic bits are frequently lost or broken. I'm waiting for some enterprising young pup with access to a 3D printer to knock out a few dozen of the plastic bits!

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Mumbles
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Re: 64 Johnson 5.5hp carb needles

Postby Mumbles » Tue Feb 13, 2018 3:26 pm

Your '64 CD has a non adjustable fixed size orifice jet, #67, instead of a needle for the high speed circuit. The low speed circuit is adjustable and the adjusting knob is in the lower pan, next to the choke knob. The '63 CD's were the last of these motors with two adjusting needles. Your motor may be missing some of its parts.
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CD-21 Carb.gif
CD-21 Carb.gif (103.44 KiB) Viewed 314 times
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Fisherman6
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Re: 64 Johnson 5.5hp carb needles

Postby Fisherman6 » Tue Feb 13, 2018 3:32 pm

The 1964 Johnson 5.5 has a fixed high speed jet (orifice plug) and an adjustable low speed. It sounds like someone changed the correct plug screw that had a post protruding from it to a plug with just the hex and possibly a screwdriver slot. Many fixed jet carbs used the slotted hex plug and to my knowledge the 64 Johnson is the only one that used the plug with the post. The post is for a plastic collar to rotate around and adjust the low speed via a linkage. See the picture below. #68 is the correct carb bowl plug screw for your motor.
-Ben

20180213_152250.png
1964 CD-21 Carb
20180213_152250.png (1.28 MiB) Viewed 313 times


As I was typing, Mumbles posted the same reply. :lol:
Ben Breitner
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jerryswiss
Posts: 33
Joined: Sun Jun 28, 2015 4:50 pm

Re: 64 Johnson 5.5hp carb needles

Postby jerryswiss » Tue Feb 13, 2018 4:03 pm

Thanks all, I think I have seen one of those set ups before. Missing parts, that makes sense now.

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Garry in Tampa
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Re: 64 Johnson 5.5hp carb needles

Postby Garry in Tampa » Tue Feb 13, 2018 7:07 pm

Parts probably missing -
11 = 0301617
70 = 0308244 link
69 = 0308243

- - - :)
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crosbyman
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Re: 64 Johnson 5.5hp carb needles

Postby crosbyman » Wed Feb 14, 2018 10:27 am

71 :-)

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Garry in Tampa
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Re: 64 Johnson 5.5hp carb needles

Postby Garry in Tampa » Wed Feb 14, 2018 5:19 pm

Right - 71 - With my dollar glasses I can only see what I write after I enlarge the type - the last operation. Then I go back to correct the wrong spelling my spell check does white I'm typing . . . :oops:
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