Buell 2003XB9S, Service Manual, Page: 270 / 588

2003 Buell XB9S: Engine 3-67
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Fitting Piston Rings
See Figure 3-97. Piston rings are of two types: compression
and oil control. The two compression rings are positioned in
the two upper piston ring grooves. The dot on the second
compression ring must face upward. Ring sets are available
to fit standard and oversize pistons.
See Figure 3-98. Piston ring sets must be properly fitted to
piston and cylinder:
Insert the new ring into the cylinder, square it in the bore
using the top of the piston and measure the ring end gap with
a feeler gauge. Do not use the ring if the end gap does not fall
within the following specifications, See
Table 3-24.
Figure 3-97. Piston Rings
1. Top compression ring – Install either side up
2. Second compression ring – Install dot toward top
3. Oil control rings
2
1
3
6612
Dot
Figure 3-98. Measuring Ring End Gap
Table 3-24. Piston Ring End Gap
Ring Type Ring End Gap
inches mm
Top compression ring 0.010-0.020 0.25-0.51
2nd compression ring 0.014-0.024 0.36-0.61
Oil control ring rails 0.010-0.050 0.25-1.27
2783b