MOTO GUZZI Daytona RS, Workshop Manual

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NOTE: The «A», «B», «C» grade cylinders must be coupled with the corresponding pistons in the
grades «A», «B», «C».
The grading measurements indicated in the tables must be taken at 24 mm from the lower edge of the piston,
at right-angles to the gudgeon pin axis.
Maximum cylinder ovalization allowed: ................................................................................................ 0.02 mm.
Maximum clearance allowed between cylinder and piston: ................................................................. 0.08 mm.
PISTONS
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.
1.52÷1.54
3.02÷3.04
22.000÷22.006
2.975÷2.990
1.475÷1.490
Ø90
0.40÷0.65
0,30÷0,60
58÷0.1
-0.006
-0.002
Ø22
Coupling data
Dia. Dia. CLEARANCE BETWEEN
PISTON PIN PISTON HOLES PISTON PIN & HOLES
mm mm ON PISTON mm
21,994 22,000
0,012÷0,002
21,998 22,006
OIL SCRAPER COMPRESSION RINGS
Each piston is fitted with: 1 upper piston ring, 1
intermediate slotted piston ring, 1 oil control ring.
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.
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.