Booxt 2007 GOES 300 S, Service Manual

Page: 67 / 188

ENGINE
4. Rock cylinder forward and backward and lift it from the
crankcase, supporting piston and connecting rod.
Support piston with Piston Support Block.
CAM CHAIN FOLLOWER /TENSIONER
BLADES
1. Remove bolt securing tensioner blade to crankcase A.
2. Remove blades and inspect for cracks, wear, or damage.
PISTON REMOVAL
1. Remove circlip. Note that opening for circlip access is
on the exhaust side.
2. Remove piston circlip and push piston pin out of piston.
If necessary, heat the crown of the piston slightly with a
propane torch.
Do not apply heat to the piston rings. The ring may lose
radial tension.
3. Remove the compression rings, starting with the top
ring.
*Using a piston ring pliers : Carefully expand ring and lift
it off the piston.
Do not expand the ring more than the amount necessary
to remove it from the piston, or the ring may break.
*By hand: Placing both thumbs as shown, spread the
ring open and push up on the opposite side. Use care to
not scratch the ring lands.
4. Repeat procedure for second ring.
5. The oil control ring is a three piece design consisting of
a top and bottom steel rail and a center expander section.
Remove the top rail first followed by the bottom rail and
expander.
CYLINDER INSPECTION
1. Remove all gasket material from the cylinder sealing
surfaces.
2. Inspect the top of the cylinder for warpage using a
straight edge and feeler gauge.
Cylinder Warp:
0.05 mm MAX
4.19