CARBURETOR
90-857046R1 NOVEMBER 2001 Page 3B-15
Idle Mixture Screw Adjustment
NOTE: Access to idle mixture screws can only be made by removing the sealing plug. Dril-
ling a small hole in the center of the plug and using an awl to pry out the plug must be done
with extreme caution. The sealing plug is very thin and the idle mixture screw is located di-
rectly behind the plug. It is recommended that additional idle mixture screws be ordered for
stock should the original mixture screw be damaged during drilling or the removal process.
Idle mixture screw adjustment is strictly regulated by the Environmental Protection Agency.
However, if the carburetor is overhauled, the EPA allows the adjustment of the mixture
screws. Each idle mixture screw (1 per carburetor) is located behind a sealing plug. The
sealing plug can be removed by carefully drilling a small hole in the center of the plug and
prying the plug out with an awl. After mixture screws have been adjusted, a new sealing plug
MUST BE installed over each mixture screw.
58473
58474
a
b
c
59245
a-Plug
b-Idle Mixture Screw (behind plug)
c-Install new plug and seat flush with casting after adjusting idle mixture screw
Idle Mixture Screw – Turns Out
1-5/8 ± 1/2
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