User Manual

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We have also found that Avgas works extremely well with these gasoline engines, mixed with Cool Power Blue you
will get the best performance and reliability from your engines.
See recommended propeller sizes in engine specifications on page 2.
For the first few flights you can keep the cowl off if possible to aid in cooling. The engine should never be run in a
test stand as they do not allow vibration energy to be properly dissipated. The engine run in should be flown at light
load and varying speed for enough time to have 3 gallons of gas run through the engine. The prop you use should
allow the engine to run at between 6700 and 7200rpm.
Once break in is completed the recommended synthetic oil is COOL POWER BLUE - 2 cycle mixed at a ratio of
45:1 .
CRANKSHAFT STUD: IMPORTANT!
When installing the propeller make sure the stud is screwed-in far enough to extend past the 7/16” shoulder of the
prop hub. The crankcase stud must engage the thick part of the hub in order to provide the necessary strength. If
the stud is not screwed-in far enough failure can occur possibly resulting in the loss if the airframe, serious injury or
death.
DRILLING THE PROPELLER AND SPINNER BACK PLATE.
The crank shaft is 8mm x 1.25 in size while the aluminum shoulder that protrudes from the prop hub is 7/16” in
diameter. You must therefore drill the spinner back plate and the rear of the prop hub to 7/16”. The rear of the
prop hub must be drilled deep enough to accept the remaining 7/16” aluminum shoulder that protrudes through the
spinner back plate.
Some prop hubs have two holes tapped into the front to keep the spinner and propeller from rotating on the hub.
Insert two hardened cap head screws into the holes and tighten securely. Then drill 2 holes in the back of the
spinner back plate that are the same size as the screw heads so the screw heads will fit into the holes when the
spinner back plate is inserted on the shaft. This will keep the spinner back plate from rotating on the shaft and if
the back plate is knurled it will keep the prop from rotating on the shaft as well. Hint: put some lipstick on the screw
heads and carefully put the back plate on the shaft and press it against the screw heads to mark the location of
holes to be drilled.
SPINNER NUT AND PROP WASHER.
The crankshaft threads are 10mm x 1.25 so use an 10mm X 1.25 spinner adapter nut to mount the spinner. Use a
steel washer between the aluminum prop washer and the nut to prevent the nut from digging into the front of the
aluminum prop washer. If the nut is allowed to dig into the aluminum prop washer it may give the impression that it
is tight when in fact it is not applying sufficient pressure against the prop.
CARBURETOR ADJUSTMENT
Every engine has been adjusted to average mixture settings which will most likely allow the engine to start and run
in most locations. However, as altitudes and barometric pressures vary by location and even by day, it is very likely
that the carburetor mixture settings will need to be adjusted to obtain optimum performance.
NOTE: Never make adjustments to the carburetor while it is running. Always use a tachometer to aid in making
adjustments to your carburetor. Some carburetor models do vary from that shown.
1 Choke Lever
2 Throttle Lever
3 Idle Speed Adjustment Screw
4 Low Speed Mixture Adjustment Screw
5 High Speed Mixture Adjustment Screw
6 Ignition Sensor
The throttle servo should control idle speed as well as be able to cut the throttle to stop the engine when
necessary.