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5. FUEL SYSTEM ATV 50
SERVICE INFORMATION
GENERAL INSTRUCTIONS
· When working with gasoline, keep away from sparks and flames..
· Note the locations of O-rings when disassembling and replace them with new ones during
assembly.
· All cables, fuel lines and wires must be routed and secured at correct locations.
· Bleed air from the oil lines whenever they are disconnected.
SPECIFICATIONS ATV 50
Venturi dia. 14 mm (0.56 in)
Identification number PB
Float level 8.6 mm (0.34 in)
Main jet # 80
Slow jet # 38S
Air screw opening 2 1/2
Idle speed 1800100 rpm
Throttle grip free play 14 mm (0.04 0.16 in)
SPECIAL TOOL
Float level gauge
TROUBLESHOOTING
Engine does not start Lean mixture
· No fuel in tank · Clogged fuel jets · Faulty float valve
· Too much fuel getting to cylinder · Clogged fuel cap vent · Float level too low
· Clogged fuel filter · Clogged fuel filter · Clogged air cleaner
· Clogged air cleaner · Bent, kinked or restricted fuel line
Engine idles roughly, stalls or runs poorly Rich mixture
· Incorrect idle speed · Clogged air cleaner · Faulty float valve
· Ignition malfunction · Intake air leaks · Float level too high
· Compression too low · Fuel contaminated · Clogged air jets
· Incorrectly adjusted air screw · Faulty reed valve
· Incorrect float level · Clogged fuel jets
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