TOHATSU NB-1000 Service Manual page 69

SECTION 3
Cleaning
DO NOT clean carburetor by submerging or
soaking in a carburetor dip cleaner or hot tank.
Do not expose plastic parts to any carburetor
cleaner.
1. Clean all metal components using a mild aerosol solvent or
5
isopropyl alcohol. Use a soft bristle brush to remove gummy
deposits.
2. Clean plastic parts with warm soapy water.
3. Dry all components with low pressure compressed air. When drying
passages, direct the flow of air opposite the direction of fuel flow.
4. Inspect the Carburetors, this section.
Inspection
DO NOT inspect passages or holes with wire or
similar materials. Doing so may scratch or enlarge
jet holes and alter the fuel-air ratio.
Before inspection, all carburetor components must
be cleaned. All worn or damaged parts must be
replaced.
1. Inspect the following float valve components:
• Check tip of float valve assembly for grooves, nicks, or
6
wear.
The float valve assembly (needle and seat) must be
replaced as an assembly.
• Check needle valve seat (2) and float
7
hinge (3) for damage.
• Check float (4) for damage and signs of fuel saturation.
2. Check tension of throttle stop screw spring (5).
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3. Inspect main jet (6) for thread damage and blockage.
7
Check all passages in main needie jet (7) are free of blockage.
3-22
CAUTION
CAUTION
NOTE
NOTE
6
7
T1129
T1130
T2051
1-/ 2-Cylinder