11-2
Engine
Problem: Engine will not start or is hard to start (Compression too low)
Condition
Remedy
1.
Valve clearance
out of adjustment
1. Adjust clearance
2.
Valve guides
worn - seated poorly
2. Repair - replace guides
3.
Valves
mistimed
3. Adjust valve timing
4.
Piston rings
worn excessively
4. Replace rings
5.
Cylinder bore
worn
5. Replace cylinder
6.
Spark plug
seating poorly
6. Tighten plug
7.
Starter motor
cranks too slowly - does not turn
7. See Electrical in this section
Problem: Engine will not start or is hard to start (No spark)
Condition
Remedy
1.
Spark plug
fouled
1. Clean - replace plug
2.
Spark plug
wet
2. Clean - dry plug
3.
Magneto
defective
3. Replace magneto
4.
CDI unit
defective
4. Replace CDI unit
5.
Ignition coil
defective
5. Replace ignition coil
6.
High-tension lead
open - shorted
6. Replace high tension lead
Problem: Engine will not start or is hard to start (No fuel reaching the carburetor)
Condition
Remedy
1.
Gas tank vent hose
obstructed
1. Clean vent hose
2.
Carburetor inlet needle
defective
2. Replace needle
3.
Fuel hose
obstructed
3. Clean - replace hose
4.
Fuel screens
obstructed
4. Clean - replace inlet screen - valve screen
Problem: Engine stalls easily
Condition
Remedy
1.
Spark plug
fouled
1. Clean plug
2.
Magneto
defective
2. Replace magneto
3.
CDI unit
defective
3. Replace CDI unit
4.
Carburetor jets
obstructed
4. Clean jets
5.
Valve clearance
out of adjustment
5. Adjust clearance
Problem: Engine noisy (Excessive valve chatter)
Condition
Remedy
1.
Valve clearance
too large
1. Adjust clearance
2.
Valve spring(s)
weak - broken
2. Replace spring(s)
3.
Rocker arm
-
rocker arm shaft
worn
3. Replace arm - shaft
4.
Camshaft
worn
4. Replace camshaft
Problem: Engine noisy (Noise seems to come from piston)
Condition
Remedy
1.
Piston - cylinder
worn
1. Replace - service piston - cylinder
2.
Combustion chamber carbon
buildup
2. Clean chamber
3.
Piston pin - piston pin bore
worn
3. Replace - service pin - bore
4.
Piston rings - ring groove(s)
worn
4. Replace rings - piston
Problem: Engine noisy (Noise seems to come from timing chain)
Condition
Remedy
1.
Chain
stretched
1. Replace chain
2.
Sprockets
worn
2. Replace sprockets
3.
Tension adjuster
malfunctioning
3. Repair - replace adjuster
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Содержание DVX 250 2007
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