Yamaha 250A Manuel D'utilisation page 200

2) Set the manual enrichment valve to
"ON".
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3) Disconnect the red emergency con-
nector. The ignition timing advance
circuit
bypassed.
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4) Squeeze the priming bulb six times to
feed fuel into the intake manifold
through
valve.
902025
5) Set the manual enrichment valve to
"OFF".
cC
If the manual enrichment valve is left
"ON", the engine will run poorly or stall.
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5-10
of the microcomputer
the manual enrichment
GB
is