FUEL SYSTEM/CARBURETION
3.8
JET NEEDLE/NEEDLE JET (3/8-3/4 THROTTLE)
The jet needle and needle jet have the most effect between 3/8 and 3/4 throttle opening. Some mixture adjust-
ment can be accomplished by changing the location of the “E” clip on the needle. Moving the clip down raises
the needle in the jet passage and richens the mixture. Moving the clip up lowers the needle in the jet passage
and leans the mixture. Letter and number codes are stamped into the needle and the jet indicating sizes and
tapers of each.
Air Jet
Throttle Valve
Jet Needle
By-pass
Pilot Outlet
Pilot Jet
Needle Jet
Main Jet
Clip Position
(Shown in #3)
1
2
3
4
5
Jet Needle “E” Clip Position
Leaner
Richer
Air Box Side
Engine Side
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