Poor Performance At Low And Idle Speed - Honda TRX70 Fourtrax 1986 Service Manual

10. Remove oil filler cap/dip stick;
check oil level
CORRECT
11 . Rimolle the valve
inspection
hole
cap and check lubrication
VALVE TRAIN LUBRICATED
PROPERLY
~
12. Check if engine overheats
NOT OVERHEATED
'3.
Jo.,.,,,.
0'
, u n at
high ,p •• d
ENGINE DOES NOT KNOCK
TROUBLESHOOTING
Oil lEVEL INCORRECT-'-----_. (1) Oil level too high
(2) Oil level too low
(3) Contaminated oil
VALVE TRAIN N O T ' - - - - - - - -•• (l) Clogged oil passage
LUBRICATED PROPERLY . (2) Clogged oil strainer
(3) Faulty oil pump
OVERHEATED - - - - - - - - - -.... ( 11 Excessive carbon build-up in com-
bustion chamber
(2) Use of rmproper quality of fuel
(3) Clutch slipping
(4) Fuel/air mixture too lean
ENGINE KNOCKS--------~ .... ('I Worn piston and cylinder
(2) Fuel/air mil(ture too lean
131 Use of improper grade of fuel
(4) Excessive carbon build-up in com-
bustion chamber
(5) Ignition timing too ad\lanced
(Faulty COl unit or pulse gener-
ator)
POOR PERFORMANCE AT LOW AND IDLE SPEED
1 . Check ignition timing and
\lal\le clearance
CORRECT
2. Ctck carburetor pilot screw
adjustment
CORRECT
~
3.
Check if air is leaking past
carburet or insulator
NOT LEAKING
4.
T~
spark test
GOOD SPARK
Probable c.u&e
INCORRECT----------~
.... (') Improper \lal\le ctearance
(2) Improper Ignition timing (Faulty
COl unit or pulse generator)
INCORRECT----------_. Improperly adjusted pilot screw
L E A K I N G - - - - - - - - - - - -•• (1) Deteriorated carburetor O-ring
12) Loose carburetor
(3) Faulty insulator or intake pipe
gasket
WEAK OR INTERMITTENT·-----.... (1) Faulty, carbon or wet fouled spark
SPARK plug
(2) Faulty COl unit
(3) Faulty alternator
(4) Faulty ignition coil
(51 Faulty pulse generator
16-3