5D-12 - WEBER 4 BARREL CARBURETOR 90-823225--1 1096
Idle Speed and Mixture
Adjustments
Thunderbolt IV Equipped Engines
PRELIMINARY IDLE SPEED AND MIXTURE
Initial start settings are given following. Make final ad-
justment with engine running (refer to “Final Idle
Speed and Mixture”).
1. Turn idle speed screw until it contacts throttle
lever.
70474
a
b
a - Idle Speed Screw
b - Throttle Lever Contact Point
2. Turn idle mixture screws (needles) in (clockwise)
until LIGHTLY seated, then back out 1-1/4 turns.
IMPORTANT: Do not turn idle mixture screws
tightly against seat, as damage to seat and/or
needle may result.
71171
a
a - Idle Mixture Screws (Needles)
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