Triumph Tiger Explorer XR 2017 Service Manual page 161

Tiger Explorer XR Series
Note
If the gudgeon pin is found to be tight in the piston, check the piston for a witness mark caused by
the circlip. Carefully remove the mark to allow the pin to be removed.
2. Remove the gudgeon pin by pushing the pin through the piston and rod toward the side from which the
circlip was removed.
Note
The rings may be removed using a proprietary piston ring expander tool or, if a tool is not available,
carefully spread the ring opening using thumb pressure then push up on the opposite side of the
ring to remove it from the piston.
3. Remove the piston rings.
Piston Ring to Groove Clearance
Note
There are three grades of piston used during manufacture, these are grades A, AB and B. For spare
parts use, only a grade AB piston will be supplied, which will fit all grades of cylinder liner.
The piston is slightly oval in shape, therefore it is important to measure the diameter in the centre of
the piston thrust faces, and at 90° to the direction of the gudgeon pin.
1. Measure the piston outside diameter, 12.5 mm up from the bottom of the piston and at 90° to the direction of
the gudgeon pin bore.
157 of 746
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1
capf
1. Piston outside diameter
2. Measurement point
3. Gudgeon pin bore
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2
3
CRANKSHAFT / RODS / PISTONS