Engine Noise; Clutch, Drive And Driven Pulleys - Honda CH250 Elite 1986 Service Manual

TROUBLESHOOTING
ENGINE NOISE
Probable cause
1
3. Cam chain noise - - - - - - - - - - - - - - - - - - - - - - - -.......(1) Damaged cam chain tensioner
I
(21
Worn cam sprocket teeth
+
(3)
Worn or damaged cam chain
4.
Crankshaft noise - - - - - - - - - - - - - - - - - - - - - - - _ ..
(1)
Worn main journal bearing
~
(2)
Worn crank pin bearing
5. Gear noise - - - - - - - - - - - - - - - - - - - - - - - - - -........ (1) Worn or damaged final reduction
gears
(2)
Worn final reduction gear shaft
splines
1. Valve noise
----------------------------l. . . . . .
(1) Valve clearance too large
I
(2)
Worn rocker arm and/or camshaft
2.
Pisto~
n o i s e - - - - - - - - - - - - - - - - - - - - - - - - - _ .. (1) Worn piston and cylinder
(2)
Worn piston pin and connecting
rod small end
(3)
Excessive carbon build-up in
combustion chamber
CLUTCH, DRIVE AND DRIVEN PULLEYS
Probable cause
1. starts, but scooter does not move - - - - - - - - - _....
) Worn or slipping drive belt
(2)
Brokenrampplate
(3)
Broken drive face spring
(4)
Separated clutch lining
(5)
Damaged driven pulley shaft
splines
(6)
Damaged transmission
(7)
Seized transmission
2. scootjer creeps or engine starts but soon stops
------------.o1. . . . .
g:
~~~~:; ~~t~~ :~~n~utch
weight
stuck
(3)
Seized pivot
3. Engine lacks power at start of a grade - - - - - - - - - - - - - - - . . . ,...... (1) Worn or slipping drive belt
(2)
Worn weight rollers
(3)
Seized drive pulley bearings
(4)
Weak driven face spring
(5)
Worn or seized driven pulley
bearings
- - - - - - - - - - - - - - - - . . . ,...... (1) Worn or slipping drive belt
(2) Worn weight rollers
(3) Worn driven pulley bearings
4. Engine lacks power
at high
!
5. There is abnormal noise or smell while running - - - - - - - - - - - -....... (1) Fouled drive belt with oil or grease
(2) Worn drive belt
(3) Weak driven face spring
(4) Worn or seized driven pulley
bearings
19~4