Quote:
Originally Posted by Texas Pete
Time to change my carb jets.
Pilot Jet #40 removed.
Pilot Jet #42 installed.
Main Jet #120 removed.
Main Jet #125 installed.
Now that covers idle to 1/4 throttle and the upper quarter to third of throtle to full open. Time to richen up the main throttle positions inbetween those extremes.
Needle is non-adjustable. This is the thickenss of the top of the needle permanantly affixed washer.
Attachment 27874
Now add a nitrile o-ring.
Attachment 27875
Not bad, just a hair thicker than the original, just a hair over 1mm additional lift on the needle to richen it up.
I used the smallest washer in the box, top left corner.
Attachment 27876
And this is the box label.
Attachment 27877
EDIT: As a starting position, I set my newly accessable Air Pilot screw out 2 turns and will tune from there after reinstalling the carburetor in the bike. 2 for sea level, 2 1/2 turns for elevation seems to be a decent starting position when not knowing. |
Very good thinking
I believe this is the final fine tuning that this carburetor needs. With Thumpers jetting plus shim and now the addition of an air screw for less than $10 you have a very good carburetor.
Great job!!
11-20-2022, 10:15 PM
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