TOHATSU NB-1000 Service Manual page 76

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
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wear.
The float valve assembly (needle and seat) must be
replaced as an assembly. lf the seat is non-
serviceable, replace the carburetor.
• Check float valve pin (1) and float chip (if applicable) for
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damage.
• Check float (2) for damage and signs of fuel saturation.
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2. Inspect pilot adjust screw (13) for thread damage. Check
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tip for grooves, nicks, or distortion.
3. Check tension of pilot adjust screw (14) and throttle stop
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screw (15) springs. DO NOT interchange the springs.
4. Inspect all jets (12) for thread damage and blockage. Check
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aIl passages in main nozzle are free of blockage.
5. Check all passages and holes with a syringe filled with isopropyl
alcohol.
1-/ 2-Cylinder
CAUTION
NOTE
NOTE
FUEL SYSTEM
10
12
T1130
T1146
T1144
3-29