Yamaha XC125 Service Manual page 90

CA.B[ ]cA.Bu. TO.
4. Accelerating with a cold engine
When an engine is not warmed-up suffi-
ciently, the mixture will be lean during
A <_ Air acceleration. The CSN system provides
B _="= Fuel
a rich mixture for smooth acceleration
c _ Mixture when the engine is cold, because the CSN
plunger is open due to the cold wax in the
thermostat. However, fuel will not be
supplied unless the engine is accelerated.
When the engine warms up sufficiently,
the plunger will close due to the warmed
wax in the thermostat.
--- (_ Starter plunger
(_) CSN plunger
(_) CSnozzle
(_) CSJet
(_) CS Air jet
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