MOTO GUZZI Daytona RS Workshop Manual page 62

PISTONS (Fig. 10-58)
During overhauls, the incrustations must be removed from the piston crowns and the piston ring seats; check the
existing clearance between the cylinders and the pistons with the grading diameter; if it is higher than that
indicated it is necessary to replace the cylinders and the pistons.
The engine pistons must be balanced; a weight difference of 1.5 grams is allowed.
22.006 ÷ 22.011
Values in mm
Coupling data
Dia.
PISTON PIN PISTON HOLES
mm
21,994
21,998 22,011
OIL SCRAPER COMPRESSION RINGS
Each piston is fitted with: 1 upper piston ring, 1
intermediate slotted piston ring, 1 oil control ring.
The piston rings must be positioned with the open
ends offset to each other.
Assembly clearance measured between ring
thickness and piston groove.
Compression ring and oil scraper:0,030÷0,065 mm.
Aperture between the ends of the piston rings
fitted on the piston
Upper compression ring and slotted ring:
........................................................ 0.40÷0.65 mm.
Oil control ring: ................................ 0.30÷0.60 mm.
Fitting of the piston in the little-end bearing
(Fig. 10-59)
When the piston is fitted in the little-end bearing, the
part marked in the figure with the arrow «A» must be
turned towards the exhaust manifold.
60
Dia. CLEARANCE BETWEEN
PISTON PIN & HOLES
mm ON PISTON mm
22,006
0,008÷0,017
1.52 ÷ 1.54
3.02 ÷ 3.04
2.975 ÷ 2.990
1.475 ÷ 1.490
Ø92
0.40 ÷ 0.65
57.9 ÷ 58.1
Ø21.994 ÷ 21.998
0.30 ÷ 0.60
10-58
A
10-59