Honda 88-91 NT650 HAWK GT Serviceanleitung Seite 250

TROUBLESHOOTING
POOR ENGINE PERFOMANCE AT SLOW AND IDLE SPEEDS
NOTE
Check the engine oil level and condition. Be sure the oil is not contaminated by coolant or metal burrs.
Start the engine and warm it up to operating temperature, then check to see if the temperature gauge indicates the normal
range. If the gauge reading is abnormal, refer to sections 5, 18.
Check the idle speed: specified
1,200 ± 100
rpm.
POSSIBLE CAUSE
NO G O O D - - - - - - - - - - - - < . - · Incorrect synchronization
WEAK OR NO S P A R K - - - - - -••• Refer to page 16-2
BETTER
-------------<.~.
Clogged air passages
Clogged jets
ABNORMAL - - - - - - - - - - - . . Improper ignition timing
(Faulty spark unit, pulse rotor, or
generator)
INCORRECT-----------.· Improper valve clearance
(too
small)
• Faulty cam chain tensioner and cam
chain guide
Worn cam chain
LOW COMPRESSION-------.... ~ ·· Improper valve and seat contact
Valve stuck open
• Improper valve timing
• Damaged cylinder head gasket
• Worn cylinder and piston rings
BETTER CONDITION--------.· Intake pipe leaking
• Improper carburetor adjustment
Clogged carburetor slow jet
Improper float level
'BETTER
CONDITION--------<.~·
Dirty air cleaner element
Improper carburetor adjustment
Clogged carburetor air passages
Improper float level
1. Check engine condition with choke
applied
I
DO NOT IMPROVE
2.
chick engine condition without air
cleaner element
I
DO NOT IMPROVE
3. chIck spark plugs on both cylinders
I
NO PROBLEM
4. chIck carburetor synchronization
I
NO PROBLEM
5 T
~
I' . .
. est cy Inder compression uSing
compression gauge
I
COMPRESSION NORMAL
6 Ch
!
k ' " . . . . .
. ec Ignition timing uSing timing
light with "F" mark.
I
NORMAL
7. chick valve train
I
NO PROBLEM
~
.
8. Clean the carburetors: air passages
and jets
I
DOES NOT IMPROVE
.... 1
-------------------------------<.~.
Seized cylinder and piston
Seized connecting rod bearing
Damaged main bearing
20-5