Yamaha SR250G Service Manual page 55

Hairopan
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When the engine fully warms up, no
mixture from the starter circuit is
necessary. Push the starter lever all the
way in so that the flow of incoming fuel
is stopped by the plunger, and thus no
mixture onters the throttle borg.
NOTE:
Use of the starter jet in either opan position
after the engine has warmed up to operat
ing tempereture will result in excessive @
heust emissions and poor performance.
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