Testing Steps (Below Minimum Level); Testing Steps (Above Maximum Level); Rated Engine Speed - Yamaha EF2000iS Service Manual

COMPRESSION PRESSURE/RATED ENGINE SPEED

Testing steps (below minimum level):

9 Squirt a few drops of oil into the cylin-
der.
9 Measure the compression again.
Reading
If higher than
without oil
If the same as
without oil

Testing steps (above maximum level):

9 Check the cylinder head, valve sur-
faces, and piston crown for carbon
deposits.
6. Install:
9 Spark plug
9 Spark plug cap
9 Rear cover 1
Refer to "COVERS AND FUEL TANK".

RATED ENGINE SPEED

1. Remove:
1
9 Rear cover 1
Refer to "COVERS AND FUEL TANK".
2. Connect:
9 Digital tachometer 1
2-19
INSP
ADJ
Diagnosis
9 Worn cylinder, piston, and
piston ring
9 Defective piston, ring(s),
valve(s), and cylinder head
gasket
9 Improper valve timing and
valve clearance
Spark plug:
20 Nm (2.0 m · kgf, 14.8 ft · lbf)
Digital tachometer:
YU-39951-B, 90890-06760