FeiaoModel DLA Series User Manual page 7

Problem3. The engine runs rough and is vibrating strongly.
Solution:
Balance the propeller. Check the ignition timing. Check your
plumbing for air/fuel leaks
Check your spark plug for carbon and check the spark plug gap.
Check the engine mount to be sure it is rigid. Check to make
sure the engine is mounted on a level surface so that crankcase
is free of tension.
Check the engine and propeller bolts.
Problem4. The engine doesn't reach a normal RPM at full
throttle.
Solution:
Check:
A. The carburetor settings.
B. See if the propeller is too large.
C. See if the engine is overheating.
D. The ignition timing.
E. The spark plug for defect.
Verify:
A. you have the correct muffler system.
B. you have the correct gasoline, oil, and have mixed them with
the correct ratio.
DLA WARRANTY POLICY
DLA engines include a limited TWO YEAR WARRANTY ON
MATERIALS AND WORKMANSHIP to the original purchaser.
This warranty does not cover the following:
•Damage caused by improper handling, operation,
modifications, or maintenance.
• Damage caused by a crash.
• Damage caused by using improper fuel or additives.
• Damage incurred during transit to After Service Center.