Service Manual

ENGINE TOP END 5-23
Cylinder, Piston
Change to a honing stone for finishing, the final bore di-
ameter should be as shown in the table. Be sure the correct
stone is used and the stone is not worn.
•
Clean the cylinder at the top and bottom of the cylinder to
remove burns and pieces of the base and head gasket.
•
Anchor the cylinder (block) on the drill press table before
honing.
•
Align the center of the cylinder bore to the press center.
Set the press to operate from 200 ∼ 250 rpm.
•
Connect the drive shaft to the hone and set the stop on
the drill press so the hone can only extend 20 ∼ 25 mm
(0.8 ∼ 1.0 in.) above the top or below the bottom of the
cylinder liner.
•
Rotate the adjusting nut (knob) on the hone until the
stones contact snugly against the cylinder wall at the
narrowest point. Do not force.
•
Turn the stone by hand. If you cannot turn it, the stone is
too tight. Loosen the hone until it can be turned by hand.
•
Be sure that the cylinder and hone are centered and
aligned with the drive shaft and drill spindle.
•
Pour honing oil inside of the cylinder during the honing
operation. Start the drill press. Move the hone up and
down in the cylinder approximately 20 cycles-per-minute.
•
Check the diameter of the cylinder bore regularly during
honing, using an inside micrometer.