First setting
when starting
Peak Speed
is obtained
Engine
Stops
1/8 turn
at a time
aircraft to prevent it from moving.
Caution 1-Do not place anything in the path of the propeller.
Caution 2-Practice flipping the propeller quickly without connecting the battery. Quick flipping and
adequate priming are important factors for starting your engine successfully.
■Needle Valve Adjustment
After the engine starts, advance the throttle to
full open. At this point, the engine should be
running very “rich” (i.e. dense smoke coming
from the exhaust). Lean (turn clockwise) the
needle valve gradually until you hear a
noticeable sound due to an increase in R.P.M.
Remove the glo-starter from the engine with
care so that it does not touch the rotating
propeller. The engine should keep running. If it
stops, lean the needle valve a little further, and
re-start the engine.
■Stop Your Engine
Cut off the fuel supply to the carburetor by pinching closed the fuel line or disconnecting the fuel
line. You may also stop the engine using your radio control system, by going below the idle
position with the throttle trim lever on your transmitter.
Caution-Do not use your hands, fingers, or any other parts of your body, or throw any object into the
propeller to stop the engine. Be careful not to touch the rotating propeller or the hot engine.
“Fine-Tuning” the Carburetor
The carburetor of your engine has been factory set for best running with fuel tank correctly
located, it should not be required to adjust anything except the needle valve. Different operating
conditions such as your choice of fuel or glow plug and the climate may make these adjustments
necessary. Large adjustments to the carb should not be required.
■Needle Valve Adjustment
To obtain optimum needle valve setting AFTER THE ENGINE IS BROKEN IN, have someone hold
the airplane and advance the throttle to full open. Slowly lean the needle setting until the R.P.M.
slows down, then richen to where the maximum R.P.M. is achieved. At that point, richen the
needle setting slightly until you hear a slight (but noticeable) decrease in R.P.M.
■Idle Mixture Adjustment
This is used to adjust the idle and low throttle fuel mixture. It is located inside the throttle
barrel on the right side of the carburetor. Start
the engine and adjust the needle valve as above.
In order to determine which way to turn this
adjustment (if any), you must first determine the
present condition of the idle fuel mixture. There
are two methods available for determining this.
Method A: Close the throttle to the lowest
position where the engine continues to run.
Disconnect the fuel tubing from the carburetor and observe carefully what happens. If the
10 11
Optimum
Seting
To Next Page
Loading...
Need help?
General
