Carburetor Tuning and Care
The use of a tachometer is highly recommended. And, again,
never adjust the needles while the engine is running!
Tuning
1. Using the tachometer tune the engine for maximum power
with the high needle (H).
2. Using the tachometer again: richen the high needle (H) until
the engine runs 100-200 RPM less than the maximum RPM.
Now you should richen slightly on the high needle (H).
Keep the engine run at idle for 60 seconds. Insure that the idle
RPM to be constant. If the low needle (L) is too rich,it may
happen that idle RPM drops until the engine stops;. Lean the
low needle (L) until a constant idle RPM is achieved.
Check the transition with a quick throttle advance. It should
sound like it is making quick steady power.
Care:
Your carburetor screen will need to be cleaned with clean
gasoline and blow off with compressed air after every flight.
Check the choke and throttle plates for tightness.
Trouble Shooting
Problem1.
The engine is flooded.
Solution:
Remove the spark plug; turn the engine to a position where the
fuel runs out and clean it.
Check the connections of spark plug, screws, restart the engine,
if it failed to start again, please send it back to After-sale service
center for repair.
Problem2.
The engine starts after being choked but then stops
soon after.
Solution:
The low needle on the carburetor is probably too lean.
Adjust the Low End needle until you achieve a smooth idle and
a reliable transition to high throttle. Generally if the motor
stutters or coughs in the mid range or when the throttle is
advanced, the low end needle is too rich and possibly even the
high end needle.
Problem3.
The engine runs rough and is vibrating strongly.
