Triumph Tiger Explorer XR 2017 Service Manual page 162

Tiger Explorer XR Series
2. Always refer to the specifications table (see Pistons).
3. Replace the piston if the measured diameter falls outside the specified limit.
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.
When checking the piston ring to groove clearance, always refer to the specifications table (see Pistons).
Note
If the ring-to-groove clearance is too large, replace the piston rings with a new set.
If the gap remains too large with new piston rings, the piston must also be replaced.
If the gap is too small, check the piston ring grooves closely for distortion, replacing the piston as
necessary. DO NOT FILE THE RING GROOVES.
Piston Ring Gap
Note
Before final assembly the piston ring gap, when fitted in the liner, must first be checked.
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 the cylinder.
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Piston Ring to Ring Groove Clearance Check
CRANKSHAFT / RODS / PISTONS