Honda NSS250S Manual page 325

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Clean carbon deposits from the ring grooves with a

Be careful not to

ring that will be discarded.

damage the piston

ring grooves.

• Never use a wire brush, it will scratch the

Inspect the piston rings for free movement by rotat-

ing them in there groove. The rings should be able

to move freely without catching.

Push the ring until the outer surface of the piston

ring is nearly flush with the piston and measure the

ring-to-groove clearance.

SERVICE LIMITS:

Second: 0.085 mm (0.0033 in)

Insert each piston ring into the bottom of the cylin-

der squarely using the piston crown.

Measure the ring end gap.

SERVICE LIMITS:

Oil (side rail):0.90 mm (0.035 in)

PISTON/PISTON PIN

Measure the piston O.D. at the point 14 mm (0.6 in)

from the bottom and 90° to the piston pin hole.

SERVICE LIMIT: 67.90 mm (2.673 in)

Calculate the cylinder-to-piston clearance (cylinder

I.D.: page 10-6).

SERVICE LIMIT: 0.10 mm (0.004 in)

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0.09 mm (0.004 in)

0.45 mm (0.018 in)

0.65 mm (0.026 in)

CYLINDER/PISTON

OLD PISTON RING

14 mm (0.6 in)

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