Yamaha pw80 - Manual (Page 32)

4. Rotate the carburetor, remove the mix­
ing chamber top, and carburetor assem­
bly.
1. Carburetor 2. Mixing chamber top
Inspection
1. Examine carburetor body and fuel
passages. If contaminated, wash car­
buretor in petroleum based solvent. Do
not use caustic carburetor cleaning solu­
tions. Blow out all passages and jets with
compressed air.
2. Examine condition of floats. If floats are
leaking or damaged, they should be
replaced.
3. Inspect inlet needle valve and seat for
wear or contamination. Replace these
components as a set.
5. Remove the float chamber body and main
jet.
Standard main jet: #125
r- IMPORTANT;--------------------------------------
The Carburetor has been set for
normal sea level conditions. The
standard setting is the result of exten­
sive testing and does not usuaiiy re­
quire changing. However, under condi­
tions of high atmospheric pressure or
heavy ioad (deep sand or mud) the
standard main jet should be replaced
with another main jet. if the carburetor
requires any other setting changes to
suit iocai conditions of aititude, weath­
er, etc., the change must be made with
great care. Improper carburetor setting
changes wiil cause poor engine perfor­
mance and possibie engine damage.
Please consult a Yamaha dealer or other
qualified mechanic about any carbure­
tor setting changes before actuaiiy go­
ing about them.
Adjustment
1. Float height
a. Checking
Hold the carburetor in an upside down
position. Incline the carburetor at
60°~70° (so that the end of the float
valve does not hang down of float
weight), and measure the distance from
the mating surface of the float chamber
(gasket removed) and carburetor to the
top of the float using a gauge.
Float height:
20.8 - 22.8 mm (0.82 - 0.90 in)
Level with carburetor base
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