RedMax G3800AVS Owner's/Operator's Manual page 22

9. Maintenance
F34
F35
22 
4. Spark plug (F34)
Clean the electrodes with a wire brush and reset
the gap to 0.65 mm as necessary.
5. Sprocket (F35)
Check for cracks and for excesslve wear interfenng
with the chain drive. If the wearing is found
obviously, replace it with new one. Never fit a new
chain on a worn sprocket, or a worn chain on a
new sprocket.
Champion
RCJ-7Y