Honda Hawk GT NT650 1988 Service Manual page 248

TROUBLESHOOTING
ENGINE LACKS POWER WITH NORMAL LOADING.
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 for engine mechanical noise: Cam chain and cam chain tensioner; improper valve clearance; worn camshaft and
rocker arm sliding surfaces; broken piston rings, worn piston pin and connecting rod small end.
Check that the wheels spin freely, check for brake drag, faulty wheel bearings, incorrect drive chain slack, bent fork, bent
frame. Refer to sections 12, 13, 14.
POSSIBLE CAUSE
1. Check exhaust smoke at half-throttle
I
NO PROBLEM
2.
c1,
'0' '"'9'09 '""09 ",,1"'00
I
NO PROBLEM
3. chLk spark plug condition
I
NORMAL
4. Check the specified fuel flow
capacity
I
NO PLOBLEM
5. Telt cylinder compression using
compression gauge
I
COMPRESSION NORMAL
[cJntinued on following page)
B L U E - - - - - - - - - - - - - - <...• Engine oil leaking; refer to sections
(OIL IN FUEL) 9, 10
GRAY - - - - - - - - - - - - -....• Rich mixture
(EXCESSIVE CARBON) Worn piston rings
Incorrect ignition timing
SURGING - - - - - - - - - - - - . . Incorrect adjusted pilot screws
• Incorrect synchronization
Intake pipe leaking
Clogged crankcase breather
WET PLUG - - - - - - - - - - - . . . . . Loose connection between spark
plug caps and wire
Dirty air cleaner element
Improper float level
Rich mixture
DISCOLOURED---------....• Improper heat range
(Light gray, White) Lean mixture
Improper float level
Leaking intake pipe
UNDER THE SPECIFIED------••• Dirty fuel filter
Clogged fuel lines
Faulty fuel pump
LOW COMPRESSION---------..,.... Valve stuck open
• Damaged cylinder head gasket
Improper valve and seat contact
20-3