DLE 20RA - Manual (Page 15)

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turn the needle to the fully stop/closed position and then open the
needle 1.5 – 2 turns). It is recommended that the High-speed Needle
be adjusted by the use of a tachometer to obtain maximum speed.
Do not “over lean” either of the low or high speed needle settings.
Remember the propeller will unload (spin faster) in the air and an
engine that is a little “rich” on the ground will normally lean out a
little in the air.
Smooth acceleration and deceleration is an indicator of proper
engine performance.
Ignition Timing Adjustment
The ignition timing is preset on the DLE-20RA at 46° before Top
Dead Center (TDC). The ignition timing can be advanced or retarded
slightly by loosening the (2) ignition sensor phillips head screws
and sliding the sensor to the full extent clockwise (47° advancing the
ignition) or counter clockwise (45° retarding the ignition). Be sure to
retighten the phillips head screws after adjusting the ignition timing.
Advancing the timing causes combustion to occur earlier, resulting
in higher performance of the engine. However, advancing the timing
also causes higher engine temperatures and can cause premature
wear of internal engine components.
Carburetor Adjustment Troubleshooting
Problem:
If The engine hesitates when accelerated rapidly.
or The rpm increases at idling.
or The engine stops when the throttle is moved from high to low.
Solution:
The low-speed needle “L” is too lean. Open it up about 1/8 of a
turn and try again.
Problem:
If The idle is not steady.
Solution:
The low-speed needle “L” valve is too rich. Close it 1/8 of a turn
and try again.
Problem:
If Engine stops at full throttle.
or Engine hesitates when accelerated rapidly.
or The engine will not come up to full rpm at full throttle.
Solution:
The high-speed needle valve “H” is too lean. Open it up 1/8 of
a turn and try again.