Technical data

aprilia
Air-injection 50 cc
Release 00 / 2002 - 09
INJECTION TROUBLESHOOTING
05 / 03Chapter.5
6-Does the engine idle normally?
NO
Has the pre-delivery procedure been followed for a new vehicle?
1- Prime the petrol pump (each time it is replaced) by:
a) switching to “ON”
b) during the 5 seconds that the petrol pump is working press and release the tank/
pump hose repeatedly
c) switch to “OFF” as soon as the petrol pump stops running
d) switch back to “ON”
e) repeat the sequence 8-10 times.
2- Check the spark plug. It may be covered with oil and need cleaning. This will improve
engine performance. Stay on high revs for about 5 minutes.
YES
(DOUBLE CHECK THE MALFUNCTION BEFORE REPLACING ANY PART)
- General diagnostics with Game-boy
- Check battery voltage
- Replace the spark plug
- Check Plug lead
- Check the ECU. See
“ECU CONTROL”
Check mechanical parts
- Is the compression ratio right? (piston rings,
piston and cylinder)
- Check the Teflon gasket for the air injector to
see if there are any traces of carbon above the
teflon ring and injector casing
- Does the engine sound strange?
- Are the oil guards and bearings in good
condition?
- Has the reed pack been damaged?
- Is the petrol filter clogged? Is it in place?
- Has the exhaust been damaged? Is it clogged?
NO
See “AIR/FUEL CIRCUIT PRESSURE CONTROL PROCE-
DURE”
YES