DLE JETBOARD, User Manual, Page: 33 / 39

30
Carburetor Tuning
:
Factory Setting
：
L
（
low speed
）
0.75turn CCW
，
H
（
high speed
）
1.25 turn CCW.
“L” needle is for tuning the fuel supply at low speed, “H” is for tuning the fuel supply at high engine
speeds. The fuel delivery is a very precise part, please tune it gently. The default setting will work in
most conditions, only change the settings if required. Because of altitude or temperature differences, a
slight tuning might be required sometimes. When the engine shows poor acceleration from low to high
speed, slightly open the L needle to increase the fuel supply. Too much fuel at low speed causes engine
shut off at idle. When the engine reaches the maximum speed, open the H needle 0.2-0.3 turn to keep the
engine running at slightly rich.
Start the engine on the water, set full throttle for 20sec. Stop the engine while it’s running at full
throttle, remove the spark plug and check the color. Brown: correct mixture; Black: too rich ; White: to
lean.
A Lean fuel mixture will make the engine overheat and burn the cylinder and piston.
Carburetor Tuning should only be done by experienced and skilled personal. (The engine can be damaged because of incorrect fuel mixture
and this will not be covered by the warranty)