aprilia
Air-injection 50 cc
Release 00 / 2002 - 09
INJECTION TROUBLESHOOTING
(DOUBLE CHECK THE MALFUNCTION BEFORE REPLACING ANY PART)
NO
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?
- General diagnostics by Game-boy
- Check the battery voltage
- Replace the spark plug
- Check Plug lead
- Check the pick-up wiring
- Check ECU. See
“ECU CONTROL”
NO
NO
See “AIR/FUEL CIRCUIT PRESSURE CONTROL PROCE-
DURE”
11 - Does the engine work properly ticking over at minimum?
12 - Are noise and vibrations normal?
NO
Check mechanical parts
- Compression ration (piston rings, piston,
cylinder)
- Unusual engine noise (seizure)
Crankshaft main bearings, crank
case and connecting rods.
05 / 06
Chapter.5
YES
YES
YES