TOHATSU NB-1000 Service Manual page 80

• Lift height of each reed valve and stopper must be within
5
specification.
2.5 / 3.5
2
No. Valves
Strips 1 Strip
Valves / Strip
2 Valves/Strip
A=Valve 0.236-0.244 in
Height (6.0-6.2 mm)
B=Gap
0.0079 in
Valve End
(0.2 mm)
Valve Seat
• Inspect entire valve assembly :
lf any part of the reed valve assembly is worn, damaged, or
corroded, entire valve assembly must be replaced.
Used reeds must never be turned over and re-
used. Reed could break when returned to
service, causing serious powerhead damage.
2. Inspect the intake manifold:
• AIl gasket surfaces must be smooth and free of nicks.
• Check manifold surface for flatness in all directions.
6
Mounting surface must be flat, within ± 0.004 in [0.10 mm].
All intake manifold components must be perfectly
clean before assembly. Use isopropyl alcohol. DO
NOT use a carburetor cleaner or a soaking tank.
1-/ 2-Cylinder
5 8 / 9.8
2 6
1 Strip 2 Strips
2 Valves/Strip 3 Valves/Strip
0.236-0.244 in 0.197-0.204 in
(6.0-6.2 mm) (5.0-5.2 mm)
0.0079 in 0.0079 in
(0.2 mm) (0.2 mm)
CAUTION
NOTE
FUEL SYSTEM
9.9 / 15 / 18 25 / 30
6 8
2 Strips 4 Strips
3 Valves/Strip 2 Valves/Strip
0.236-0.244 in 0.236-0.244 in
(6.0-6.2 mm) (6.0-6.2 mm)
0.0079 in 0.0079 in
(0.2 mm) (0.2 mm)
5
40
12
4 Strips
3 Valves/Strip
0.236-0.244 in
(6.0-6.2 mm)
0.0079 in
(0.2 mm)
T1151
T2056
3-33