Linhai ATV 500-D T3 EFI Service Manual page 44

CHAPTER 3 ENGINE
Connect fuel enrichment
device wire lead with
battery for 5 Minutes.
Connect ethylene pipe
with fuel increment loop
and blow.
Poor Engine Performance in Hi-speed Range or Slow Speed Rising
Run vehicle at high engine speed
(on an flat asphalt road)
Engine speed rises
Check ignition timing
Correct
Measure compression pressure
with pressure meter
Normal compression pressure
Check carburetor
Not clogged
Check spark plug
Normal Spark Plug
Check the engine for
overheating
Overheated
Accelerate or continuous
high-speed operation
No cylinder knock
With Air current
No air current
No rise of
Engine speed
Incorrect
Low or no
Compression
Pressure
Clogged
Stained damage and color changed
Overheated
Cylinder knock
LH500ATV-D T3 EFI SERVICE MANUA 19.0
Faulty fuel enrichment device
Clogged carburetor
Clogged air filter
Clogged fuel hose and filter
Clogged fuel tank cap breather hole
Clogged muffler
Faulty pickup coil
Faulty CDI unit
Worn Cylinder and piston ring
Faulty cylinder gasket
Clogged carburetor
Spark plug stained and damaged
Improper spark plug heat value
Faulty mixture gas
Faulty fuel
Carbon deposit in combustion Chamber
Too much advanced ignition timing
Carbon deposit in combustion chamber
Clutch slip
CHAPTER 3 ENGINE PAGE. 3- 11