Pro Boat PRB3250 - Manual (Page 8)

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Water Pump
The water pump is operated from crankcase
pressure. Be sure that water is exiting the 2 water
jackets mounted on the left side of the boat when
the engine is running and the boat is in the water. If
water does not stream out of either the exhaust or
cylinder head cooling ports, immediately stop engine
operation and remove obstructions in the lines or
replace broken cooling lines.
Hint: To test each cooling line
for obstructions or a leak in the
cooling system, place a piece of
tubing over the water inlet tubes
in front of the rudder and blow
into the tube. When testing for
obstructions in the cooling system,
be sure to isolate each system by
pinching the appropriate water lines.
Water-Cooled Cylinder Head and Exhaust
Manifold Cooling Jacket
The exhaust system is cooled independently from
the cylinder head. See line drawings for proper
cooling line routing. Do not alter the cooling line
routing method.
Section 13: Cooling System
Zenoah ® G26M Engine
Carburetor
Insulator Plate
Water-Cooled
Cylinder Head
Tuned Pipe
Manifold Cooling Plate
Water Pump
Rudder
Pick-Up
Tube
Rudder
Pick-Up
Tube
Water
Outlet
Water
Outlet
The centrifugal clutch automatically engages when
the engine rpm is increased. Be sure that the idle
speed adjustment is set low enough so that the
propeller does not rotate at idle.
Periodically disassemble the clutch and clean debris
from the clutch shoes and the inner clutch bell with
DYN5505 Dynamite® Nitro Force.
Section 14: Clutch