Yamaha LB2 1978 - Page 88

c. Engine/Exhaust system. See "No start".
3. Poor mid-range and high speed performance
a. Ignition systems
Possible cause
Remedy
Spark plug gap incorrect
Clean and gap or change spark plug
if necessary.
Ignition
timing incorrect Reset.
Points set too close
Regap/Reset timing.
b. Air/Fuel systems
Possible cause Remedy
Dirty air filter element Clean.
Carburetor float level incorrect
Measure and adjust if required.
Incorrect main jet size Remove jet and check size.
Incorrect jet needle clip position
Check needle clip position.
Cracked or leaking reeds
Remove and repair as necessary.
Carburetor not level Level.
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