AquaCraft 27 Rear Exhaust Airboat Engine - Manual (Page 4)

4
GET TO KNOW THE SOUNDS AND SIGHTS OF YOUR ENGINE:
• Rich needle setting means less than maximum RPM. The engine
will operate with a break in the exhaust note. Also take note that
when rich, the engine is going to use more fuel than normal and
you are going to end up with a lot of oil and smoke coming out of
the exhaust pipe.
Lean needle setting means lots of RPM followed by lean sags in
the exhaust note. Fuel consumption will be minimized and you will
not see much oil or smoke exit the exhaust pipe. If you suspect your
engine is running lean, bring the boat to shore as soon as possible
and richen the HSN.
• The perfect needle setting will provide a good RPM and a clean,
clear sound. You’ll see some light oil and smoke from the exhaust
pipe and a tanned, slightly dull but not distorted, glow plug element.
TIP: At the risk of a slower operating boat, it is best to error on the
rich side of the needle setting.
AFTER RUN MAINTENANCE:
After you are done boating for the day, you are going to want to add
some after-run oil to the engine to protect the internal parts. We
recommend removing the glow plug, opening the carburetor all the
way, and placing 10 to 12 drops of after-run oil down the barrel of the
carburetor. Place a rag over the glow plug hole and turn the engine
over with the starter. Repeat this step at least one more time to make
sure the inside of the engine is fully coated.