MACHINE TUNING 4-5
MAIN SYSTEM
MAIN JET (M.J.)
The main jet, like the slow jet, meters fuel flow. Each jet size is
indicated by a number. Larger number means a larger bore
diameter and fitting a larger number main jet enriches the
air/fuel mixture.
* Included alternated parts
INTERMEDIATE SYSTEM
JET NEEDLE (J.N.)
The jet needle is linked to the throttle valve by means of the nee-
dle clip. Its lower part is tapered and it has seven grooves cut in
the upper part where the needle clip fits.
Air/fuel
mixture
SIZE P/NO.
Lean #150 09491-30018
#152 09491-30019
#155 09491-31012
#158 09491-31013
#160 09491-32010
#162 09491-32011
* #165 09491-33009
#168 09491-33010
#170 09491-34010
#172 09491-34011
* #175 09491-35009
#178 09491-35010
#180 09491-36008
#185 09491-37008
Rich #190 09491-38011
O.D. of Needle
Clip
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