Irregular Functioning At Low Speed; Irregular Functioning At High Speed; Unstable Manoeuvrability - APRILIA SR 50 Service And Repair Manual

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3.1 Incorrect ignition stroke.
3.2 Incorrect adjustment of the carburettor.
– Too weak fuel-air mixture.
– Too strong fuel-air mixture.
3.3 Air infiltration in the fuel intake manifold.
– Loose carburettor.
– Defective fuel intake manifold.
3.4 Weak or intermittent spark.
– Defective stator/coil.
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4.1 Limited fuel flow.
– No fuel.
– Clogged fuel pipe.
– Clogged fuel filter.
– Vacuum tap malfunctions.
– Damaged vacuum pipe.
4.2 Clogged jet.
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5.1 Heavy steering.
– Wrong adjustment of the steering ring,
insufficient clearance (excessive preload).
– Damaged steering head bearings.
– Bent fork rod.
5.2 One of the two wheels wobbles.
– Excessive clearance of the front wheel bearings.
– Deformed rim.
– Excessively worn engine pin bearings.
– Deformed frame.
5.3 Vehicle pulls.
– Deformed fork stems.
– Deformed engine connection link.
– Deformed frame.
5.4 Vehicle vibrates.
– Check the wear of the connection link silent-
blocks.
– Check the spring at the end of stroke of the
connection element.
2%-%$9
– Check the ignition stroke.
– Correct the mixture.
– Correct the mixture.
– Tighten properly.
– Change.
– Change.
2%-%$9
– Refuel.
– Clean or change.
– Clean or change.
– Change.
– Change.
– Clean.
2%-%$9
– Loosen and adjust.
– Change.
– Change.
– Change the bearings.
– Change.
– Change.
– Change.
– Change.
– Change.
– Change.
– Change.
– Change.
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SR 50