3.19
ENGINE
3
Honing To Deglaze
A finished cylinder should have a cross-hatch pattern to ensure
piston ring seating and to aid in the retention of the fuel/oil
mixture during initial break in. Hone cylinder according to hone
manufacturer's instructions, or these guidelines:
• Honing should be done with a diamond hone. Cylinder
could be damaged if the hone is not hard enough to
scratch the nicasil lining.
• Use a motor speed of approximately 300-500 RPM, run
the hone in and out of the cylinder rapidly until cutting
tension decreases. Remember to keep the hone drive
shaft centered (or cylinder centered on arbor) and to
bring the stones approximately 1/2, (1.3 cm) above and
below the bore at the end of each stroke.
• Release the hone at regular intervals and inspect the
bore to determine if it has been sufficiently de-glazed,
and to check for correct cross-hatch. NOTE: Do not
allow cylinder to heat up during honing.
• After honing has been completed, inspect cylinder for
thinning or peeling.
If cylinder wear or damage is excessive, it will be necessary to
replace the cylinder. The cylinders are lined with a nicasil
coating and are not repairable. Hone only enough to de-glaze
the outer layer of the cylinder bore.
IMPORTANT: Clean the cylinder after honing
If cylinder wear or damage is excessive, it will be necessary to
replace the cylinder. The cylinders are lined with a nicasil
coating and are not repairable. Hone only enough to de-glaze
the outer layer of the cylinder bore.
Cleaning the Cylinder After Honing
It is very important that the cylinder be thoroughly cleaned after
honing to remove all grit material. Wash the cylinder in a
solvent, then in hot, soapy water. Pay close attention to areas
where the cylinder sleeve meets the aluminum casting (transfer
port area). Use electrical contact cleaner if necessary to clean
these areas. Rinse thoroughly, dry with compressed air, and oil
the bore immediately with Polaris Lubricant.
Example of Cross Hatch Pattern
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