APRILIA RST mille Futura 2001 Service Manual page 326

RST mille
USA
DEFECT
The engine does not idle
smoothly
The engine runs irregularly
at higher speeds
Engine lacks power
Release 00/2002 - 03
SYMPTOM AND POSSIBLE CAUSES
Idle rpm too slow
Air filter dirty
Intake manifold leaking
Both cylinders poorly synchronized
Throttle valve shaft/housing worn
See the subsection entitled "Engine difficult or impossible to start" for other possible
causes
The fuel outlet fitting is dirty, limiting the flow of fuel to
the injector
Intake ducts and lines clogged
Air leaking through the throttle body or intake manifold
Fuel pressure too low
Faulty fuel pump
Camshafts worn
See the subsection entitled "Engine difficult or impossible to start" for other possible
causes
Spark plugs dirty
Spark plugs not to spec
Insufficient valve clearance
Exhaust system faulty
Valve timing incorrect
Valve springs faulty
Valve seats leaking
Intake coupling or intake system leaking
Clutch slippage
Motor oil does not meet specifications
Air filter dirty
Faulty fuel pump
Fuel pressure too low
Injector dirty
Piston rings worn
GENERAL INFORMATION
REMEDY
Adjust
Clean
Replace
Synchronize the cylinders
Replace
Clean and top up the fuel
system
Check
Replace
Clean the fuel system or
replace the pump
Replace
Replace (*)
Clean or replace
Replace
Adjust (*)
Replace
Adjust (*)
Replace (*)
Reface seat (*)
Replace
Replace the clutch discs and
springs (*)
Use motor oil that
meets specifications
Replace
Replace
Replace the fuel pressure
regulator or check the pump
Replace
Replace (*)
CONT'D ➤
8
- 4 -
00