YG125-30A Maintenance Manual
Cylinder Head, Cylinder and Piston
58
4.
After properly timing, pull off the tensioner locking
key and coat the mixture of engine oil and
molybdenum disulfide on the tensioner to make it
tensioned; mount the sprocket retaining plate and
retaining bolt
5.
Mount the bolt and washer at the tail end of the
tensioner.
6.
Mount the cylinder head cover (See Installation of
cylinder head cover), and adjust the valve clearance
7.
Connect the phase sensor and mount the eyehole
cover and upper eyehole cover in turn.
Caution
When the tensioner is not tensioned, never turn the
crankshaft for fear of interlocking the teeth while
timing.
Camshaft inspection
Check the camshaft for abrasion, damage, oil through
jamming, etc. and check whether the decompressor flying
block can rotate and return smoothly.
Measure the maximum IN / EX lift.
Maintenance limit: IN
≥≥
5.5057mm
, EX
≥
5.515mm
Cylinder head
To remove the cylinder head:
1.
Remove the muffler exhaust pipe
2.
Remove the engine cycle tube
Tensioner
Max. lift measurement
Outside micrometer
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