Derbi Senda Baja R 125 4T Manual Del Usuario página 105

Senda R/SM 125 4T Baja 22/11/06
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Symptom
Engine does not start
Exhaust noise decreases:
engine tends to stop with
throttle fully opened
The engine does not run
smoothly
Irregular engine exhaust
The engine detonates and makes
backfiring noises while accelera-
ting or when running up hill
High fuel consumption
10:25 Página 105
Possible causes
- Fuel valve closed or empty tank;
- Spray, carburetor body or valve dirty or
stuck
- Irregular or weak ignition
- Flooded engine
- Air filter stuck or dirty
- Carburetor is too dirty
- Spark plug damaged
- Irregular engine performance
- Mixture too rich
- Air filter stuck or dirty
- Starter lever locked in the closed position or
half open
- Other causes (carburation, low compres-
sion, etc.)
Procedure
- open the fuel valve or refill the fuel tank.
- remove and wash with gasoline, dry with compressed air
- remove the spark plug and after connecting it to the ignition with the
specific cap (placing one end of it in contact with any metal part away
form its housing of the cylinder head) check that when starting the engi-
ne without load, ignites a spark between the electrodes. In the opposite
case, repeat the operation with a new spark plug before proceeding to
other operations of the ignition system controls..
- Close the fuel valve in the fuel tank, and accelerate at maximun speed
and press the starter switch. If the engine does not start, push the vehi-
cle, if not, remove the spark plug, clean it or replace it. Before installing
it, run the engine without load to eliminate the excess of fuel.
- Check if the float needle is waterproof.
- Replace the air filter element.
- Check that:
- The spray is not rusted or dirty
- The fuel flows normally
- Spark plug is not dirty or damaged.
- Clean and replace the spark plug
- Check the wires that feed power and their connections to the main con-
trol.
- Check the air filter element and replace it if necessary.
- Replace the filter element.
- Unlock the sparter level at he carburetor and lubricate it with grease.
- Visit your nearest Dealer or Distributor DERBI
How to troubleshoot
105