Buell 2007 FIREBOLT Service Manual page 296

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Fitting Piston Rings
6612
1
2
1. Top compression ring – Install either side up
2. Second compression ring – Install dot toward top
3. Oil control rings
4. Dot
Figure 3-91. Piston Rings
NOTES
See Figure 3-91. Piston rings are of two types: compression
(1, 2) and oil control (3). The two compression rings are posi-
tioned in the two upper piston ring grooves. The dot (4) on the
second compression ring must face upward.
3
4
Figure 3-92. Measuring Ring End Gap
1. See Figure 3-92. 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 3-23.
Table 3-23. Piston Ring End Gap
Ring Type
Top compression ring
2nd compression ring
Oil control ring rails
NOTES
The same piston may be used if cylinder bore was not
changed, unless it is scuffed or grooved. If re-using pis-
ton, replace piston rings and hone the cylinder walls with
a No. 240 grit flexible hone to facilitate ring seating.
Piston ring sets must be properly fitted to piston and cyl-
inder:
2007 Buell Firebolt: Engine
2783b
inches mm
0.010 - 0.020 0.25 - 0.51
0.014 - 0.024 0.36 - 0.61
0.010 - 0.050 0.25 - 1.27
3-65