Pro Boat PRB2050T - Manual (Page 6)

Section 6: The Dynamite .32 Marine Engine
Water-Cooled Engine
Because the Dynamite
® .32 engine is water-cooled and not air-
cooled, make sure that you do not run the engine for an extended
amount of time outside of the water. Continuously monitor the
water outlet when the boat is running to make sure that water is
flowing through the engine head. If the water does not reach the
head to cool it, the engine will overheat and fail. This will cause
permanent damage to the engine.
Carburetor
The Dynamite carburetor is adjusted at the factory. This
setting should be approximately 1
3 ⁄
4
– 2 1 ⁄
2
turns open for the
high-speed and 2 1 ⁄
2
turns open for the low-speed needle. This
should give you a slightly "rich" mixture of fuel to the engine.
This setting is the safest way to break in your engine. For
further details regarding the carburetor, see the Dynamite .32
instruction manual.
Note: When using the pull-starter, never pull the rope out to
its full length as doing so can cause damage and the rope
may not retract. Quick, short pulls of the starter rope are
the best technique to use with the pull-starter.
If the pull-starter becomes very difficult to pull, the engine may be
hydro-locked (flooded). Excessive fuel between the head and
piston will not let the piston travel to TDC (Top Dead Center).
Loosen the glow plug one turn and try to start the engine. If the
engine starts, re-tighten the glow plug with the attached glow
driver while the engine is running. If you are still unable to get
your engine to start, refer to the Troubleshooting Guide (page 7)
in this manual.
You may have to "blip" the throttle on the transmitter (applying
throttle on/off) while trying to start the engine. New engines are
harder to start because of the tight piston/sleeve fit. Never start
an engine at
1 ⁄
2
to full throttle, as this will cause over-revving
which may cause premature wear and breakage.
During the first tank of fuel, advance the idle via the idle adjust-
ment screw more than normal to prevent stalling at idle due to the
rich fuel mixture for break-in. Pinch the fuel line nearest the
carburetor to stop the engine.
Breaking in Your Engine
The first start-up of the engine is the most critical moment of the
engine’s life, dictating how the engine will perform from that time
forward. Turn on your radio system and attach a fully charged
glow igniter (DYN1925) to the glow plug. Start the engine with the
recoil (pull-start) on the engine.
During break-in, the low-speed needle should be slightly rich and
the high speed needle should be very rich. After a few tanks of
fuel, begin to lean the engine out. Adjust the high-speed needle
1 ⁄
16
of a turn at a time. It generally takes about five to six tanks of
fuel before you want to lean out the engine until it supplies good
power. Do not skip this process of break-in. Failure to follow
this procedure could damage your new engine. For further
details on breaking in your engine, please see the seperate
Dynamite .32 instruction manual.
Note: It is common for an ABC engine to go through a glow
plug or two during break-in.
Needle Settings
When adjusting the settings, always adjust the needles in small
increments, about
1 ⁄
16
of a full turn at a time. Do not set the engine
too lean, as it shortens the reliability of the engine.
After you have attained the correct needle settings, the engine will
have a strong sounding, high-pitched whine at full speed, and a
thin trail of blue/white smoke will come from the exhaust.
Idle Adjustment
The last setting to set is the idle screw. To obtain a higher idle,
turn the idle screw clockwise; for lower idle, turn the idle screw
counterclockwise.
Replacement Parts
In the event that you need to replace an engine part, there is a
complete parts listing in the Dynamite .32 instruction manual.
Exploded views will help you to select the correct parts and make
minor repairs.
Head Shims
Several head shims are added at the factory to make the engine
easier to start when new. After break-in, you may remove all but
one of theses shims to increase compression and power.
High-Speed
Needle Valve
Faster Idle
(clockwise)
Idle
Stop Screw
Leaner
Low-Speed
Needle
Valve
Slower Idle
(counterclockwise)
6
Leaner
Fuel Inlet
(Adjustable)