APRILIA RS 660 User Manual

Selecting connecting rods
SELECTING CRANKSHAFTS AND CONNECTING RODS ACCORDING TO BALANCING CLASS
crankshafts and connecting rods have been introduced which are matched with each other in relation
to their balancing class. The class is easily identifiable as it is marked on the component itself.
Key:
1) Primary side main journal class; Primary side
connecting rod pin class;
2) Centre main journal class;
3) Flywheel side main journal class; Crankshaft
weight class; Flywheel side connecting rod pin
class;
4) Connecting rod dimensional class;
5) Connecting rod weight class.
The weight class of both connecting rods must match the weight class of the crankshaft.
The permitted crankshaft-connecting rod balancing class combinations are listed in the following table:
CRANKSHAFT - CONNECTING ROD BALANCING CLASSES
Crankshaft weight classes Connecting rod weight classes (marking / weight)
E1 E1 (301.5 g - 304.49 g)
E2 E2 (304.5 g - 307.49 g)
E3 E3 (307.5 g - 310.49 g)
E4 E4 (310.5 g - 313.49 g)
E5 E5 (313.5 g - 316.5 g)
Every single connecting rod, regardless of the weight class can have dimensional class 1 or 2.
Dimensional class 1: 39.010 mm - 39.016 mm
Dimensional class 2: 39.017 mm - 39.022 mm
CONNECTING ROD - CRANKSHAFT COUPLING BUSHING SELECTION
Once the connecting rods have been selected according to the weight class, the correct bushings must
be selected for the connecting rods-crankshaft coupling.
According to:
- Dimensional class of crankpin (X, Y, Z);
- Dimensional class of connecting rods (1, 2);
Engine RS 660 - Tuono 660
ENG - 188

APRILIA RS 660 Specifications

General

Displacement	659 cc
Bore x Stroke	81 mm x 63.93 mm
Compression Ratio	13.5:1
Maximum Power	100 HP (73.5 kW) @ 10, 500 rpm
Maximum Torque	67 Nm @ 8, 500 rpm
Transmission	6-speed
Frame	Aluminum dual beam chassis
Front Tire	120/70 ZR 17
Rear Tire	180/55 ZR 17
Seat Height	820 mm
Dry Weight	169 kg
Wet Weight	183 kg
Engine Type	Parallel twin
Fuel System	Electronic fuel injection with 48 mm throttle bodies
Front Suspension	Kayaba 41 mm upside-down fork, adjustable rebound and preload
Rear Suspension	Kayaba monoshock, adjustable rebound and preload
Front Brake	Dual 320 mm discs, Brembo radial calipers
Rear Brake	220 mm disc, Brembo caliper
ABS	Cornering ABS
Fuel Capacity	15 liters
Electronics	Ride-by-wire, multiple riding modes, traction control