Suzuki LT-Z400 - Piston and Piston Ring; Piston Diameter; Piston Ring Thickness

ENGINE 3-31
PISTON AND PISTON RING
PISTON DIAMETER
Measure the piston diameter using the micrometer at 15 mm
(0.6 in) from the skirt end.
If the piston diameter is less than the service limit, replace the
piston with a new one.
& 09900-20204: Micrometer (75 – 100 mm)
% Piston diameter
Service Limit: 89.880 mm (3.5386 in)
PISTON-RING-TO-GROOVE CLEARANCE
Measure the side clearances of the 1st and 2nd piston rings
using the thickness gauge. If any clearance reading exceeds the
service limit, replace both the piston and piston rings.
& 09900-20803: Thickness gauge
09900-20205: Micrometer (0 – 25 mm)
% Piston-ring-to-groove clearance
Service Limit:
1st: 0.180 mm (0.007 in)
2nd: 0.150 mm (0.006 in)
% Piston ring groove width
Standard:
1st: 0.78 – 0.80 mm (0.0307 – 0.0315 in)
1.30 – 1.32 mm (0.0512 – 0.0520 in)
2nd: 0.81 – 0.83 mm (0.0319 – 0.0327 in)
Oil: 2.01 – 2.03 mm (0.0791 – 0.0799 in)
% Piston ring thickness
Standard:
1st: 0.71 – 0.76 mm (0.0280 – 0.0299 in)
1.08 – 1.10 mm (0.0425 – 0.0433 in)
2nd: 0.77 – 0.79 mm (0.0303 – 0.0311 in)
15 mm
(0.6 in)