Rotax 122 Reparaturhandbuch Seite 24

Trouble Possible
Engine with poor performance in the lower speed
Interruption
range
Clogged air filter
Exhaust system leaking or blocked
Compression
Electronic
Exhaust valve (RAVE) stuck in position "OPEN"
Engine with not enough performance in the high
Carburetor floating / level of float valve set too high
speed range
Sealing cone of float valve needle dirty or worn
Carb jets blocked or loose
Exhaust valve (RAVE)
Electronic
Pinging of engine at full load, traces of pinging on
Wrong type or heat range of spark plug
piston crown
Shortage of fuel
Exhaust system or end muffler blocked or inappropriate
Air intake system (air box; filter element) clogged or unsuitable unit
fitted
Compression
Compression
combustion
Octane rating of fuel too low
Too much
24 - 1995
cause
Remedy
in the fuel system Clean fuel system and carburetor
Clean
Clean or renew exhaust system retorque exhaust flanges
ratio too low •see
ignition control faulty Check ignition unit, control of ignition timing
Check Bowden cable, solenoid,
clean
Clean carburetor,
Clean carburetor,
Clean carburetor,
Check
stuck in position "closed"
clean
ignition advance faulty Check ignition unit, control of ignition timing
Exchange spark plug (NGK BR 10 EG)
Check fuel system and carburetor
venting);
unit fitted Clean exhaust system / fit genuine APRILIA air intake system
Clean air intake system / fit genuine APRILIA air intake system
Verify squish gap Of I
ratio too high
compression
ratio too high / carbon deposits on piston crown and
Cleaning
chamber insert
Use unleaded fuel of at least 95 RON octane rating; on engine
version without
leaded
ignition advance Check ignition unit, verify Ignition timing by stroboscopic
ROTAX
or renew air filter
chapter "Engine will not start"
control unit and exhaust valve,
exhaust valve
readjust float valve
renew float valve needle
tighten jets
Bowden cable, solenoid, control unit and exhaust valve,
exhaust valve
(float level, fuel cock, tank
clean complete fuel system
mm min. (by solder wire), check
and rectify
catalyst (especially for competition) premium,
fuel is more suitable
lamp
TYPE 122