20
~
30°
15
Needle-valve adjustment(2)
As the needle-valve is closed beyond the initial readjustment,
the rpm of the engine will be increased and a continuous high-
pitched exhaust note, only, will be heard.
Key to the needle-valve
adjustment.
(Turn 15-30˚ at a time.)
Turn the needle-valve 15-30˚ in the direction of arrow, and wait
momentarily for the change of r.p.m.
After the rpm of the engine increases, turn the needle-valve
another 10-15˚ and wait for the next change of r.p.m.
As the speed of the engine does not instantly change with
needle-valve readjustment, small movements, with pauses
between, are necessary to arrive at the optimum setting.
16
Needle-valve adjustment(Summary)
Practical best(optimum) needle-valve setting
Disconnect battery leads from
glowplug at about this point.
Maximum rpm setting("Lean").
"Rich" needle-valve
setting when starting
the engine.
E
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i
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e
s
t
o
p
s
R
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v
o
l
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i
o
n
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t
a
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t
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c
r
e
a
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.
t
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The engine may stop if the battery leads
are disconnected from the glowplug while
the engine is running rich.
NOTE: The above sketch is for reference purposes only.
Actual needle positions may differ from those shown.
19
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