5. FUEL SYSTEM
5-2
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 1800±100 rpm
Throttle grip free play 1～4 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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