AquaCraft 27 Rear Exhaust Airboat Engine User Manual
®
.27 AIRBOAT ENGINE
operating your engine. These instructions have been
read this instruction manual before
written so that you may get the greatest satisfaction
from the operation of your new engine.
Important: Please fully
SPECIFICATIONS:
Bore: .716" (18.2mm)
Stroke: .653" (16.6mm)
Displacement: 4.3cc
Weight: 12 oz (339.5g)
ENGINE PARTS:
7
3
6
Power Output: 1.35 hp @
28,000 RPM
Crankshaft Thread Size: 1/4-20
Carburetor Type: Rotary
4
2
1
9
8
5
1. Crankshaft
2. Carburetor
3. Crankcase
4. Cooling Head
5. High Speed Needle (HSN)
6. Low Speed Needle (LSN)
7. Idle Stop Screw
8. Throttle Arm
9. Fuel Inlet Nipple
2
ITEMS NEEDED TO OPERATE YOUR ENGINE:
• Propeller (9x6)
• Exhaust system (AQUB6432)
• Glow Igniter (HCAP2520)
• 12V Star ter Battery (HCAP0800)
• Starter (HCAP3200)
• 10-15% Glow Fuel for Airplanes*
*For best performance, avoid using fuel formulated for R/C boat or
car use.
WARNING: Use caution when handing your boat with the engine
running. The spinning prop can be hard to see and can injure you.
ENGINE BREAK-IN:
Take your time and do not hurry the break-in. If you operate the
engine too rich or too lean during the break-in stages you could
damage the engine. If you can avoid it, don’t allow the engine to run
out of fuel during the break-in period.
Factory needle settings: HSN: 2-1/2 turns out
LSN: 1 turn out
NOTE: Due to atmosphere changes the factory needle settings could
be too rich or too lean. It is important to note that as long as the engine
is running rich during break-in, it is safe from any damage. If you live
near sea level, you might want to open (turn out, counterclockwise)
the HSN 1/2 turn before attempting to operate the engine.
• Run 1: Run the engine full throttle at a rich setting for one tank of
fuel. Note the sound of the engine. It should burble with an unsteady
sound. After the run allow the engine to cool completely.
• Run 2: Repeat run one.
• Runs 3 – 6: Start the engine and allow it to warm up. As it’s running
lean the HSN until you hear the engine jump from a rich 4 cycle
sound to a clean 2 cycle sound. Richen the HSN 1/4 turn and run
the remaining fuel from the tank.
3
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