WITH CLASS SELECTION
Characteristic
Minimum piston diameter
Class A: 77.961-77.971 mm (3.0693-3.0697 in).
Class B: 77.971-77.981 mm (3.0697-3.0701 in)
Maximum clearance between the cylinder and
piston
With piston class A: 0.027-0.045 mm
(0.0010-0.0017 in). With piston class B:
0.025-0.043 mm (0.0009-0.0016 in)
Maximum wear limit of the pin hole on the pis-
ton
0.055 mm (0.0022 in)
Maximum permitted clearance between piston
ring 1 (starting from the bottom) and the cor-
responding slot on the piston
0.1 mm (0.0039 in)
Maximum permitted clearance between piston
ring 2 (starting from the bottom) and the cor-
responding slot on the piston
0.1 mm (0.0039 in)
Maximum opening of the piston ring fit on the
piston
0.3 mm (0.0118 in)
Minimum wear limit of the thickness of piston
ring 1 (starting from the bottom)
0.077 mm (0.0030 in)
Minimum wear limit of the thickness of piston
ring 2 (starting from the bottom)
0.070 mm (0.0027 in)
Selecting connecting rods
If a selection class of connecting rods is fit on
the crankshaft that is not class D - D, it is not a
problem.
It is essential, for proper crankshaft balance, that
if one connecting rod is replaced the other one fit
on the same crank pin must also be replaced:
Engine TUONO V4 R
ENG - 326
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