2003 Buell P3: Engine 3-45
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Fitting Piston Rings
See Figure 3-75. 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.
Piston ring sets must be properly fitted to piston and cylinder:
1. See Figure 3-76. Insert the new ring into the cylinder,
square it in the bore using the top of the piston and mea-
sure the ring end gap with a feeler gauge. Do not use the
ring if the end gap does not fall within the following spec-
ifications, See Table 3-27.
NOTE
Ring end gap dimensions also apply to oversize rings.
Replace ring if end gap exceeds specification. If end gap is
under specification, filing is permissible.
Figure 3-75. 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 3-76. Measuring Ring End Gap
Table 3-27. Piston Ring End Gap
Ring Type
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
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