© Aixro GmbH / Woelfle Engineering GmbH
18/23
8. TROUBLESHOOTING
Problems can also occur with the XR50. Some can be resolved at the track with basic
knowledge, while other problems should only be handled by an expert. Generally you should
only do work you are comfortable with. If you feel overwhelmed or unsure, your dealer will be
available to help you or to contact aixro for support.
!
If the engine suddenly runs differently, there will be a reason for this, so don’t just
keep going. Try to find the problem and solve it. While doing so, keep a particularly
close eye on the water and bearing temperature. If you should be uncertain, you
should rather contact your dealer directly.
8.1. Engine Dropout
The root cause for dropouts is normally an issue of fuel supply. If the carburettor does not get
enough fuel, a fuel line may be blocked, or the depression line between the engine and the
fuel pump can be damaged. It might also just be an empty fuel tank that causes the problem.
If dropouts occur in fast or tight turns, it can be helpful to turn the carburettor, so the float
bowl points to the outside (up to 20° from vertical position). Another option is to modify the
float level, so the needle valve in the carburettor closes at a higher fuel level.
8.2. Engine Stutters
Note that the engine tends to run rich with a dirty air filter. If the engine does not run
smoothly, or if it stutters at 4000..6000rpm, check the air filter and clean it if necessary.
If the vent pipes of the carburettor have sharp bends, the carburettor function may be con-
stricted as well.
Another root cause can be a malfunction of the ignition. If the ignition spark loses its inten-
sity, the combustion is delayed. The carburettor setting then feels rich, even though this is
not the problem.
! When the engine suddenly starts to stutter, do not try to correct this condition with a
leaner carburettor jetting as this will only hide the root cause and lead to insufficient
engine lubrication.
! If you experience stuttering, please observe the bearing temperature carefully, as it
may also be a symptom of an overheated main bearing.
8.3. Backfire Under Braking
If the engine is too lean at botto
m end, it will make a “bang” sound under braking. In this case
you should lift the carburettor
’s jet needle by putting the securing clip one position down.
8.4. No Engine Start
If the engine will not start despite a fully charged starter battery, clean air filter and sufficient
fuel supply, the spark plug may be the problem (although this is unlikely). To check, remove
the spark plug from the engine. If it is wet and oily with excessive soot, you should replace it
and properly dispose the old spark plug.
! Only use the original Denso U22ETR spark plug. Failure to do so can result in engine
damage, as a too long spark plug could collide with the apex seals.
If the engine should not start, the reason could also be the off-switch. Check the switch and
wiring for damage.
Содержание XR50
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