Linhai ATV 260 Service Manual page 158

CHAPTER 3B ENGINE 50cc/80cc
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
Carburetor
Venturi Bore
Fuel level
Main Jet
Idle Jet
Idle Speed
Throttle Free Play
Mixture screw setting
Special tools required- Float Gage
Troubleshooting
Hard Starting Engine
·No Spark
·Low Compression
·No fuel in carburetor
-Blocked fuel line
-Blocked fuel filter
-Blocked vacuum line
-Leaky vacuum line
-Dirty float needle
-Float set too high
Too much fuel to engine
-Blocked air filter
-Manifold air leak
-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
standard valve
Constant velocity-CVK
18mm
20.5 mm
#82
#35
1900±190 RPM
2-6mm
2 turns±1/4 turn
Poor Drivability
·Weak spark/Bad Ignition System
·Blocked fuel line
·Blocked fuel filter
·Bad fuel
·Water in fuel
·Air leak at carburetor or manifold
·Improper float level
·Bad auto chock
·Obstructed jet in carburetor
·Vacuum slide stuck
·Damaged vacuum diaphragm
·Dirt in carburetor
CHAPTER 3B ENGINE
ATV SERVICE MANUAL07.0
PAGE 3B - 52 -