Pro Boat PRB2850 - Manual (Page 8)

1 1
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.
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
Problem Possible Solution
Engine will not start Improper needle setting: see Zenoah® engine manual; baseline settings are 2 turns out
for high-speed, 1 turn out for low-speed
Out of fuel: fill fuel tank
Improper fuel: use fresh gasoline & Zenoah 2-cycle oil (mixed 32 parts gas to 1 part oil)
Bad Spark plug: replace
Flooded engine: remove spark plug, invert boat and operate the pull-starter to
remove fuel
Engine starts, then dies Fuel line blocked or broken: connect or replace fuel line
Reset needles to baseline setting: see Zenoah instructions
Engine starts and runs for Bad fuel: replace
several minutes, then dies Improper needle settings: see Zenoah engine manual
Overheated engine: check for clogged or damaged cooling system
Debris in carburetor, disassemble carburetor and clean
The hull of the Blackjack 55 is finished using the
highest quality paints and the most advanced
painting methods available. The base coat/clear
cote technique delivers an amazing shine that is as
durable as it is beautiful. To keep your Blackjack 55
looking new, you should apply a wax coating as used
on automotive finishes to prevent oxidation and to
further protect against damage caused by fuel and
other harmful chemicals
Section 14: Cooling System Section 15: Troubleshooting Guide
Water Pump
Carburetor
Water-Cooled
Cylinder Head Manifold Cooling Plate
Section 16: Hull Care