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Yanmar Pleasure Boat Marine Engine Help
WHY set the IDLE RPM?
Correct idle rpm will:
- help prevent excess vibration
- prevent engine stalling while gear changing
- increase gearbox life
IDLE RPM by engine model
| Engine model | Hand held tachometer |
| GM series | 825 - 875 |
| JH and JH2 series | 775 - 825 |
| 4JH2-UTE | 675 - 725 |
| 4JH3E | 775 - 825 |
| 4JH3 turbo models | 675 - 725 |
| LH series | 725 - 775 |
| LY series | 670 - 730 |
| LP series | 725 - 775 |
| CX series | 670 - 730 |
When using the boat tacho to set the rpm, use the upper end of the range.
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