Aprilia Consumer Service Spa
Technical Service and Training
Release 4 july 99
This material is didactic and
may be changed following the technical
development of the product
SECTION 09
PBTL SYSTEM
The PBTL system on the RSV 1000 reduces the ‘braking’ torque transmitted by the engine during deceleration.
OPERATING PRINCIPLE:
Line 1 is connected to the intake passage whereas line 2 – downstream of the retaining valve – is connected to
the airbox via the throttle valve. Line 3 links line 2 to the airbox when the throttle valve opens to an angle greater
than 10-12 degrees.
During deceleration, the system configuration is as shown in the figure.
The negative pressure in the intake passages is transmitted to the clutch membrane via line 1+2.
The ‘retaining’ valve (non-return) comes into play and stabilises the pressure in the line.
Consequently, the clutch discs slip and reduce the torque.
During acceleration (throttle valve >12°), the valve, connected on the throttle unit axis, links up line 2 with the
airbox, thus cancelling out the pressing effect on the clutch unit and taking the clutch pack back to its original
position.
2
3
1
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