aprilia
Air-injection 50 cc
Release 00 / 2002 - 09
INJECTION TROUBLESHOOTING
05 / 05
Chapter.5
(DOUBLE CHECK THE MALFUNCTION BEFORE REPLACING ANY PART)
9 - Half-open the throttle: does the vehicle maintain speed?
NO
YES
10 - Is top speed normal?
NO
Check mechanical parts
- Are all transmission parts (belt, variator) working properly?
- 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 check-up with Game-Boy and
reset errors (butterfly valve at “O” if
required)
- Check the battery voltage
- Replace the spark plug
- Check Plug lead
- Check the pick-up wiring
- Check ECU. See
“ECU CONTROL”
- Is the variator working properly?
NO
NO
See “AIR/FUEL CIRCUIT PRESSURE CONTROL PROCE-
DURE”
Check mechanical parts
- Are all transmission parts (belt, variator) working properly?
- 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?
- Is the variator working properly?
- 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”
YES
YES
YES
YES
YES
