Suzuki PE175 Owner's Manual page 55

—— CARBURETOR/CARBURATEUR
MATCHING THE JETTING TO THE RACE
Drive the machine on the racing course, making several laps
and noting the pattern. of throttle variation required to
cover the lap for best clocking. Then, open the engine to
observe the spark plug, cylinder head and piston crown. On
the basis of this observation and also the throttle range in
which the machine had to be driven in the test run, set the
main jet, jet needle and pilot air screw by referring to the
diagram below.
REGLAGE DE CARBURATION EN FONCTION DE LA
COURSE
Throttle
1⁄4 | 1⁄2 | 3⁄4 | Ful
| Ouverture du papillon des gaz
1⁄4 | 1⁄2 | 3⁄4 | Pleins gaz
Jet needle
Pilot air screw
Vis d ' a i r de ralenti
Gicleur principal | — €j
Pointeau de carburateur ——
NOTE: The length of each shaded pattern represents the
effective range, and the width represents the intensity of
carburetion.