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The needle itself rotates out of position. We’ve only put about 10 hours on the boat since acquiring the motor, so I’d say suddenly. I was testing the boat out with the cover over the jets and choke off, to check for any leaks. The brass barrel and needle fell out once. (Luckily into the boat). I reinstalled and after 20 minutes the needle itself fell out. I reinstalled the needle, took boat for ride with the cover installed, but the jet rotated out of adjustment. It stopped at the rich setting pin.
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Replace the packings. #61 on high speed needle, #64 on slow speed needle (Actually all the same packings). It takes 3 or 4 packings on each, whatever will fit in the spaces.
As for the part numbers, there are two ways. The one I used in this case was that I have an old (1964) parts price list. Simply look up the old and any changes will be listed. Secod ay is to pad the old number with zeros to make it a six or seven digit number. For example, your 41-123 becomes 041123 or 0041123. Look for that number in a new parts book and it will show the price or superseded number (if it hasn’t gotten lost in history).
The end of the packing nuts and bottom of the threaded holes is tapered. That squishes the packings against the rotating needle. Not necessary, but an improvement, some newer motors added thin nylon washers at the ends of the packing stacks to make them more durable.
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