2007 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 (3). The top (1) and second (2) compression
rings are positioned in the top and second upper piston ring
grooves. The dot (4) on the second compression ring must
face upward. Ring sets are available to fit standard and over-
size 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. Refer to 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
4. Dot
2
1
3
6612
4
Figure 3-76. Measuring Ring End Gap
Table 3-27. Piston Ring End Gap
RING IN. MM
Top compression 0.010-0.020 0.25-0.51
2nd compression 0.014-0.024 0.36-0.61
Oil control ring rails 0.010-0.050 0.25-1.27
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