DAELIM Daystar VL125E Service Manual page 141

Cylinder / Piston
Cylinder
Removal
Remove the cylinder head(Section 8).
Remove the cam chain guide from the
cylinder.
Loosen the cylinder mounting bolt, and
remove the cylinder.
Remove the gasket and dowel pins. Remove
the gasket from the cylinder.
NOTE
Avoid damaging the gasket surface.
Inspection
Measure the cylinder inside diameter in 6
places of top, middle, bottom with the piston
pin direction and right-angled direction(X-Y
direction), and record them. The cylinder
inside diameter sets the maximum value.
Service Limit:56.60mm(2.228in)
Measure the piston outside diameter.(
Subtract the piston outside diameter from the
cylinder inside diameter, and then get the
cylinder-to-piston clearance.
Service Limit : 0.15mm(0.006in)
Figure out the taper(balance between the X
direction and Y direction) and out of round(inside
diameter balance of the top, middle, bottom parts
by X or Y direction). Choose the maximum value
regardless of any one, and settle the taper and out
of round.
Service Limit:Taper) 0.05mm(0.002in)
Out of round) 0.1mm(0.004in)
The boring assembly of cylinder measure the
outside diameter of the over size piston. And
then perform the boring assembly so that the
cylinder-to-Piston clearance become the
standard value.
Over Size: 0.25mm(0.010in), 0.50mm(0.020in)
0.75mm(0.030in), 1.00mm(0.039in)
10-2
Cam Chain Guide Cam Chain Guide Cam Chain Guide Cam Chain Guide
Cam Chain Guide Cam Chain Guide
Cam Chain Guide Cam Chain Guide Cam Chain Guide Cam Chain Guide
Cam Chain Guide Cam Chain Guide Cam Chain Guide
Gasket Gasket Gasket Gasket
Gasket Gasket
Gasket Gasket Gasket Gasket
Gasket Gasket Gasket
9-4)
Dowel Pins Dowel Pins Dowel Pins Dowel Pins
Dowel Pins Dowel Pins Dowel Pins Dowel Pins
Dowel Pins Dowel Pins
Dowel Pins Dowel Pins Dowel Pins