Yamaha SRX440 1980 Service Manual page 40

1980 SRX440
4) Blow the air bent and slow circuits with
compressed air.
jet
3. Pilot air jet
Slow circuit
2. Main air jet
Pe .. erjet
eiletlit
Starter jet circuit
6) Blow the main jet, pilot jet. power jet
and main nozzle with compressed air.
7) Blow the pilot screw clean of dust and
dirt with compressed air.
8) Check the end of pilot screw for carbon.
Check the tapered portion and threaded
portion for damage.
3) Check the starter circuit for clogging
with dust. If clogged, blow if off with
compressed air.
5) Blow the starter circuit, main air
and pilot air jet with compressed air.
NOTE:
-------~_-~-­
If the starter circuit is clogged, fuel flow will
be hindered and hard starting will result.
1. Starter circuit
2) Check the power jet circuit for clogging.
If clogged, blow it with compressed air.
care not to scratch the seat, and blow
it with compressed air.
Check the end of the valve needle and
the valve seat for damage.
If damaged, replace the valve needle
and valve seat as an assembly.
a. Float chamber
1) Check the starter jet and power jet
circuits for clogging with dust. If clogg-
ed. blow them off with compressed air.
2) Blow the float chamber clean of dust
and dirt with compressied air.
b. Carburetor body
1) Clean the fuel valve seat while taking
AUTlON: - - - - - - - - - ,
A scratched seat could result in the
overflow of fuel.
1. Starter jet circuit
2 Power jet circuit
NOTE:
- ~ - - - - - - - - - ­
If this circuit is clogged, engine power loss
will result at high speed operation.
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