aprilia
Air-injection 50 cc
Release 00 / 2002 - 09
INJECTION TROUBLESHOOTING
05 / 08
Chapter.5
PRESSURE VALUES (BAR) FOR THE AIR AND FUEL CIRCUITS
IN OPERATION
OFF
MINIMUM
MAXIMUM
AIR CIRCUIT
2 - 5
4.2
÷ 6
< 6.2
FUEL CIRCUIT
+ 2.5 ± 0.2 bar
+ 2.5 ± 0.2 bar
+ 2.5 ± 0.2 bar
(DOUBLE CHECK THE MALFUNCTION BEFORE REPLACING ANY PART)
NO
Attach pressure gauge to air circuit
NO
During cranking check the maximum
compressor pressure, blocking the delivery
hose between the pressure gauge fuel rail.
Is it above 4 bar?
Check:
- the reed pack
- hoses
- oil seals and bearings
- air injector
- replace air compressor if necessary
YES
NO
Does the pressure stay remain?
If the pressure drops suddenly, check:
-
hoses
- replace air compressor if necessary
YES
NO
Repeat cranking without blocking the
hoses.
Is the air pressure above 2 bar?
Check:
- the reed pack
- oil seals
- bearings
- O ring and injector housing
- replace air injector if necessary
N.B. Petrol pressure is above 2.5 bar