Piston Ring End Gap Inspection

• Place the piston ring [A] inside the cylinder (upper crankcase), using the piston to locate the ring squarely in place. Set it close to the bottom of the cylinder, where cylinder wear is low.
• Measure the gap [B] between the ends of the ring with a thickness gauge.

Piston Ring End Gap Standard:

Top 0.20 0.30 mm (0.0079
0.0118 in.)

Second 0.35 0.50 mm (0.0138
0.0197 in.)

Service Limit: Top 0.6 mm (0.024 in.)

Second 0.8 mm (0.031 in.)

If the end gap of either ring is greater than the service limit, replace all the rings.