Pro Boat PRB2850BD - Manual (Page 8)

8
m 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.
m Periodically disassemble the clutch and clean debris from
the clutch shoes and the inner clutch bell with DYN5505
Dynamite ® Nitro Force ™ .
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
Section 13: Clutch Section 14: Cooling System
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 tube in front of each 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 photo for proper cooling line routing. Do not alter
the cooling line routing method.
Water Pump Carburetor
Water-Cooled
Cylinder Head
Manifold Cooling Plate