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