Acceleration To High Speed - Hamilton Jet HJ212 Installation And Service Manual

Installation and Service Manual
At slow displacement speeds avoid using high RPM in shallow water.
If it is not possible to pick a deep water area to start and stop in, then "idle" over the shallow area into deep
water before accelerating up to planing speed. If any debris has been picked up in the intake screen,
momentarily stopping the engine should allow the debris to drop away from the screen.

Acceleration to High Speed

Make sure that the water level is below the level of the inspection cover before removing.
Running at speed with a partially blocked intake screen or debris on the impeller will
result in cavitation damage to the jet unit.
When leaving an area of shallow or debris filled water, ensure jets are well clear of the debris before
accelerating to high speed.
If debris accumulates in the jet unit, the engine will run at higher than normal RPM and the vessel will
accelerate slowly and may not reach full (planing) speed.
Prior to commencing operations, remove the inspection cover and check for debris around the impeller or
intake screen.
Figure 20: Shallow Water Operation Slow Speed
Figure 21: Shallow Water Operation Idle
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