DLE 20 - Manual (Page 13)

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turn the needle to the fully stop/closed position and then open the
needle 1.5 turns). It is recommended that the High-speed needle
be adjusted by the use of a tachometer to obtain maximum speed.
Smooth acceleration and deceleration is an indicator of proper
engine performance.
Ignition Timing Adjustment
The ignition timing is preset on the DLE-20 at 38-40° before Top Dead
Center (TDC). The ignition timing can be advanced or retarded by
loosening the (2) ignition sensor Phillips head screws and sliding
the sensor to the full extent clockwise (41° advancing the ignition)
or counter clockwise (37° retarding the ignition). Be sure to retighten
the Phillips head screws after adjusting the ignition timing. It is
best to attach the sensor with the screws centered in the slot as a
starting point.
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.