GD Rapter RR BC 20-42.7 Original Owner's Manual page 26

2. LOW OUTPUT
Symptom
Flame out when speedup
The smoke is thin
Carburetor spout backward
Compress press is shortage
Engine leak
The end of two crank shaft leak
3. ENGINE RUNNING UNSTABLE
Symptom
there are knock sound in engine
there are metal knock sound
engine ignition break off
26
TROUBLE SHOOTING GUIDE
Probable cause
Fuel filter obstruct
fall short of fuel
muffler fouled with oily deposits
piston
piston ring
cylinder attrite
conjoint surface of the
cylinder and crank cass leak
the seal is bad
engine overheats
burning room fouled with
oily deposits
Probable cause
piston, piston ring,
cylinder attrite
piston pin, piston attrite
bearing of crank shaft attrite
engine overheats
burning room fouled with
oily deposits
gasoline branded is unfit
there is water in fuel
spark gap is wrong
coil gap is wrong
Remedy
Clean fuel filter
Clean fuel road
adjust carburetor
clean the oily deposits
replace piston
piston ring
repair
replace seal
avoid use it for long time
high speed and heavy load
clean the oily deposits
Remedy
replace piston, piston ring
replace piston pin, piston
replace bearing
avoid use it for long time
high speed and heavy load
clean the oily deposits
replace require branded octane
instead fuel
adjust spark gap 0.6-0.7 mm
adjust coil gap 0.3-0.4 mm