Linhai 2005 ATV 260, Service Manual

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CHAPTER 3B ENGINE 50cc/80cc
ATV SERVICE MANUAL07.0
CHAPTER 3B ENGINE PAGE 3B - 52 -
3.8.1General Information:
WARNING! Work on the fuel system in a well-ventilated area free form sparks or open
flames. Do not breath the vapors from the gasoline. Wear protective gloves to prevent skin
irritation.
·
Open the bowl drain and allow all gasoline in the carburetor to drain into an appropriate container
prior to removing or servicing it.
·
Remove control cables and wires carefully to prevent damage.
·
Check all ‘O’ rings for damage. Replace as necessary.
·
Remove carburetor from the scooter before attempting to service the fuel bowl or vacuum
diaphragm.
·
When cleaning the carburetor, remove the vacuum diaphragm before using air or solvents for
cleaning. This will prevent damage to the diaphragm.
·
When storing the scooter for any period of time exceeding one month, use a quality fuel stabilizer to
prevent deterioration of the fuel and damage to the carburetor.
Repairing material
Specification standard valve
Carburetor Constant velocity-CVK
Venturi Bore 18mm
Fuel level 20.5 mm
Main Jet #82
Idle Jet #35
Idle Speed 1900
±
190 RPM
Throttle Free Play 2-6mm
Mixture screw setting 2 turns
±
1/4 turn
Special tools required- Float Gage
Troubleshooting
Hard Starting Engine Poor Drivability
·
No Spark
·
Weak spark/Bad Ignition System
·
Low Compression
·
Blocked fuel line
·
No fuel in carburetor
·
Blocked fuel filter
-Blocked fuel line
·
Bad fuel
-Blocked fuel filter
·
Water in fuel
-Blocked vacuum line
·
Air leak at carburetor or manifold
-Leaky vacuum line
·
Improper float level
-Dirty float needle
·
Bad auto chock
-Float set too high
·
Obstructed jet in carburetor
Too much fuel to engine
·
Vacuum slide stuck
-Blocked air filter
·
Damaged vacuum diaphragm
-Manifold air leak
·
Dirt in carburetor
-Bad auto choke
-Blocked air passage in carburetor
Air/Fuel mixture too rich or too lean
·
Bad auto choke
·
Plugged idle jet
·
Float needle stuck or dirty