Chapter 5 – Fuel feed system
Service manual AJP PR3/PR4 5 - 1
SERVICE INFORMATION
GENERAL
! WARNING !
Working in a location with adequate
ventilation. Smoke, flames or sparks in the
workplace or where gasoline is stored can
cause a fire or explosion.
Before cleaning the air and fuel passages with
compressed air, make sure that the
secondary air pump is removed otherwise it
may be damaged.
When removing the feeding system, observe
the location of the sealing rings. Replace with
new where, during assembly, show wear or
damage.
Note:
By removing the carburetor, place a
suitable container for gasoline under the end
of the drain tube, preventing spread gasoline.
After removing the carburetor, seal the engine
intake nozzle orifice using a clean cloth or
cover it with tape to prevent foreign material
from entering the engine.
PR3 / PR4 models only consumes unleaded
gasoline with minimum 95 octane. Never use
leaded gasoline to not destroy the catalyst
and the exhaust system of the motorcycle.
If the bike remain immobilized or stored for
more than one month, drain the float
chamber. Leave gasoline in the float chamber
without the bike being used for long periods of
time can cause obstruction of the jets,
resulting in difficulties to put the engine
running at start or inadequate driving the
vehicle.
! DANGER !
Fuel is extremely flammable and explosive
under certain conditions. KEEP IT AWAY
FROM CHILDREN.
Work in a well-ventilated area with the engine
stopped.
Do not smoke, do not let flames or sparks in
the work area or where the fuel is stored.
Clean immediately any spillage of fuel.
SPECIFICATIONS
Item
Specification
Fuel pump
Paiolli, by vacuum
Outlet pipe
between deposit /
filter
Ø9x5x220mm
Outlet pipe
between filter /
pump
Ø9x5x220mm
Outlet pipe
between pump /
derivation T
Ø9x5x170mm
Feeding tube
between T /
carburetor
Ø9x5x60mm
Return pipe
between T /
deposit
Ø9x5x385mm
Vacuum tube
between the pump
/ intake manifold
Ø9x5x210mm
SERVICE INFORMATION
5 – 1
FUEL PUMP
5 – 5
TROUBLESHOOTING
5 – 2
CARBURETOR
5 – 8
AIR FILTER BOX
5 – 3
ADJUSTMENTS
5 – 20
FUEL TANK
5 – 4
SPECIFICATIONS FOR
CARBURETORS SET-UP
5 – 23
FUEL FILTER
5 – 5
ASSEMBLY SCHEMES
5 – 25