Triumph DAYTONA 675 Service Manual page 119

Crankshaft, Connecting Rods and Pistons
Piston Rings/Ring Grooves
Check the pistons for uneven groove wear by visually
inspecting the ring grooves.
If all the rings do not fit parallel to the groove upper and
lower surfaces, the piston must be replaced.
Clean the piston ring grooves.
Fit the piston rings to the pistons. Check, using feeler
gauges, for the correct clearance between the ring
grooves and the rings. Replace the piston and rings if
outside the specified limit.
EM
Piston Ring to Ring Groove Clearance Check
Piston ring/Groove Clearance
Top ring
Service limit
Second
Service limit
5.14
Service Manual - Daytona 675, Street Triple and Street Triple R
0.040 - 0.080 mm
0.095 mm
0.020 - 0.060 mm
0.075 mm
Piston Ring Gap
Note:
•
The piston ring gap, with the piston ring
fitted in the liner, must be checked before
final assembly.
1. Place the piston ring inside the liner.
2. Push the ring into the top of the cylinder, using the
piston to hold the ring square with the inside of the
bore. Continue to push the ring into the bore until
the third groove of the piston is level with the
cylinder top, around the full circumference of
cylinder.
Aligning Piston Rings using the Piston
1.
Remove the piston and measure the gap between
the ends of the piston ring using feeler gauges.
Piston Ring End Gap Tolerances
Top
Service limit
Second
Service limit
Oil Control
Service limit
Note:
•
If the end gap is too large, replace the piston
rings with a new set
• If the gap remains too large with the new
piston rings, both the pistons and barrels
must be replaced
•
If the gap is too small, check the cylinder
bore for distortion, replacing as necessary.
Do not file piston rings!
0.10 - 0.25 mm
0.37 mm
0.25 - 0.40 mm
0.52 mm
0.10 - 0.35 mm
0.49 mm
It,I MP