Horizon Hobby Evolution Radial Glow E777 Manuel D'instructions page 10

EN
Test
1. Allow the engine to run at idle with the on-board glow driver ON. Observe the engine RPM.
2. Turn the on-board glow driver OFF.
If the engine RPM immediately drops, the low-speed needle is too rich. Lean the low-speed
needle (turn clockwise).
If the engine continues to run at the same RPM with the on-board glow driver OFF,
the low-speed needle setting is close to ideal.
Low-Speed Needle Tuning
1. Adjust the high-speed needle for the current conditions.
2. With the on-board glow system off (if using one) or the glow starting battery disconnected, al-
low the engine to idle for 10–15 seconds. Rapidly advance the throttle from idle to full open.
If the engine transitions with no hesitation, the low-speed needle is adjusted perfectly.
If the engine slowly responds to throttle change and gradually reaches peak RPM, the
low-speed needle is too rich. Lean out the low-speed needle (turn clockwise) 1/8 turn
and test again.
If the engine immediately stops running, the low-speed needle is lean. Richen the low-speed
needle 1/8 turn and test again.
3. When the low-speed needle is adjusted correctly, check the high-speed needle setting again.
4. When you are satisfied with the needle settings, you should not need to adjust the low-
speed needle again. The low-speed needle setting is mechanically controlled and it does
not change with atmospheric conditions.
Maintenance
There are a few things you must do to ensure proper operation of your Evolution radial engine.
1. Use a high-quality gear oil to lubricate the outer parts of the valve train at the beginning
of each flying day.
2. Use a high-quality, after-run oil such as Evolution Blue Block (EVOX1001 or EVOX1002) at
the end of each day's flying. After-run oil protects the inside of the engine from corrosion
and un-burnt fuel in the crankcase.
How to Apply Evolution Blue Block After-Run Oil
1. At the end of the flying day, empty the fuel tank.
2. Attach the glow starting battery to the plugs, and, with the engine at the normal starting
throttle position, start the engine.
3. With the throttle at idle, allow the engine to die of fuel starvation.
4. With the throttle still at idle, restart the engine and allow it to die. Repeat as necessary
until the engine will not start. You have now insured that most all of the un-burnt fuel is
out of the engine crankcase.
5. Remove the glow heat.
6. Remove one of the pushrods from the number one cylinder and then remove the
cam follower pin. You now have access to the crankcase to insert the after-run oil.
7. Insert 5–10ml of EVO Blue Block After-Run Oil through the cam follower guide.
8. With the throttle wide open and no glow heat applied, rotate the engine with an electric
starter, or by hand, through 8–10 revolutions to disperse the oil throughout the engine.
9. Replace the cam follower pin and the pushrod. Leave the throttle wide open. Your
engine is now ready for short term storage and awaits its next day at the field.
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