Derbi ATV DXR 200, Workshop Manual

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7-1-4. Start engine again
A. Engine fires but does not start
1). Faulty choke control system
2). Leaking intake manifold
3). Incorrect ignition timing or incorrectly adjusted air screw
B. Engine does not fire --- refer to 7-2-5.
7-1-5. Remove the spark plug and test it again
A. Wet spark plug
1). Flooded carburettor
2). Throttle valve excessively open
3). Clogged air cleaner
B. Dry spark plug
7-2. P
OOR
P
ERFORMANCE
(
ESPECIALLY AT LOW AND IDLE SPEED
)
7-2-1. Check ignition timing
A. Incorrect
1). Faulty GDI unit
2). Faulty pulse coil
B. Correct --- refer to 7-2-2.
7-2-2. Check carburettor air screw adjustment
A. Incorrectly adjusted
1). Mixture too lean (Turn screw in)
2). Mixture too rich (Turn screw out)
B. Correctly adjusted -- refer to 7-2-3.
7-2-3. Check carburettor gasket for air leaks
A. Air leaks
1). Faulty intake manifold gasket
2). Loose carburettor lock nut
3). Broken heat insulator
4). Cracked vacuum tube
B. No air leaks --- refer to 7-2-4.