View single post by redracer
 Posted: 09-14-2020 08:10 pm
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redracer

 

Joined: 09-10-2012
Location: BROOKHAVEN, Georgia USA
Posts: 652
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 The plastic plug with "O" ring is the later style; the brass plug with the screw was earlier(but NOT on any J-Hs) which by turning in or out would adjust the needle/gas mixture.
The earlier ones had a fixed needle that would not move, whereas the later style uses a 1/8" allen wrench to move the needle up & down for the mixture