Linhai HY510S Service Manual page 43

CHAPTER 3 ENGINE
Unstable Idle Speed
check ignition Timing
Correct
check carburetor
mixture screw
Correct
Check if secondary air
intake into carburetor
joint
No Air intake
Remove spark plug and mount it
to spark plug cap, get it earthed
and check spark
Normal spark
Remove fuel enrichment device
wire lead and check continuity
Normal Continuity
Connect fuel enrichment
device wire lead with
battery for 5 Minutes.
Connect ethylene pipe
with fuel increment loop
and blow.
No air current
Incorrect
Incorrect
Air intake
Weak spark or
No spark
No Continuity
With Air current
LH500ATV-D SERVICE MANUAL14.0
Faulty pulse generator
Faulty CDI unit
Refer to fuel system (Engine Service)
Faulty tightening of carburetor joint
Faulty reed valve seal washer
Stained or damaged spark plug
Faulty Ignition coil
Faulty high tension coil or short circuit
Faulty ignition switch
Faulty CDI unit
Broken cable of fuel enrichment device
Faulty fuel enrichment device
Faulty fuel enrichment device
Clogged carburetor
.
CHAPTER 3 ENGINE PAGE. 3- 12