Linhai 2005 ATV 260, Service Manual

Page: 48 / 341

CHAPTER 3A ENGINE
260/ 300 cc ATV SERVICE MANUAL07.0
CHAPTER 3 ENGINE PAGE. 3A- 11
NOTE :
Insufficient compression pressure will result in
performance loss.
1. Check:
z
Valve clearance
Out of specification Adjust.
Refer to “CALCE CLEARANCE ADJUSTMENT”
section.
2. Start the engine and let it warm up for several
minutes.
3. Turn off the engine.
4. Remove:
z
Spark plug
Before removing the spark plug, use com
pressed air to blow away any dirt accumulated
in the spark plug well to prevent it from falling
into the cylinder.
5. Attach:
z
Compression gauge
c
6. Measure:
z
Compression pressure
If it exceeds the maximum pressure allowed
→
Inspect the cylinder head, valve surfaces and
piston crown for carbon deposits.
If it is below the minimum pressure
→
Squirt a few drops of oil into the affected cylinder
and measure again. Follow the table below.
Compression pressure
(With oil applied into cylinder)
Reading Diagnosis
Higher than
without oil
Worn or damaged pistons
Same as
without oil
Possible defective ring (s),
valves,
cylinder head gasket or
Piston
→
Repair.
Compression pressure(at sea level):
Standard:
1,400 kPa (14Kg/cm
2
, 14 bar)
Minimum :