TOHATSU NB-1000 Service Manual page 113

The ring end gap must be within specification:
Model
2.5 / 3.5
5
8 / 9.8
9.9 / 15 / 18
25 / 30
40
Assembly
Before assembly of the powerhead, all components
must be perfectly clean and lightly coated with
genuine engine oil or a NMMA certified TC-W3 oil. All
serviceable gaskets and seals must be replaced.
1-/ 2-Cylinder
Standard Ring End Gap
in [mm]
0.007 - 0.013 [0.18 - 0.33]
0.008 - 0.016 [0.20 - 0.40]
0.007 - 0.013 [0.18- 0.33]
0.008 - 0.016 [0.20 - 0.40]
0.013 - 0.019 [0.33 - 0.48]
0.08 - 0.019 [0.33 - 0.48]
NOTE
POWERHEAD
Repair Limit Ring End Gap
in [mm]
0.031 [0.8] or over
0.031 [0.8] or over
0.031 [0.8] or over
0.031 [0.8] o rover
0.031 [0.8] or over
0.031 [0.8] or over
4-33