Honda C72 - Page 90

2, Engine paes nat develope full po wer
II I
1
21
13 1
141
lSI
1
61
171
Stand the vehicle an the main stand and rotate the r ear whee l by h and w: ,en
the ch
arging gear is set in neutral, if wheel does not turn easil y;
I-I.
1 -2.
1 -3 .
Dragging rear brake- incorrect adjustment
Damaged
whee l bea ring
T
oo tight dri ve chain tension, in co rrect adjustment
Check the ty re air pressure and innate to the specific amount.
Check th e clutch for slip and if it is found sl ippi ng;
3-1.
3-2.
Im proper adjustment of clutch
Worn clutch facing
3-3 . Weakened clutch springs
Measure the highest revolutions of crankshaft with a revolution coullter and if the
engine
does not d evelope full r evolution;
4- 1.
4- 2.
4- 3.
4- 4.
4- 5.
4-6 .
4 -7 .
4
-8 .
4-9.
Choked carbur etler at somewhere
Clogged air cl ean er
Insufficient su pp ly of fuel to the intake
Clogged muffler
Faulty ign ition coil or contact breaker po ints
Faulty seating
of valve
I ncorrec t ignition t imi ng
Excess weak valve springs
Fau l ty s park plug; test the spark plug with spark plug tester
Check oil level in t he crankcase and adjust the level to th e speCificat ion , or
excess amount of oil result in th e tr ouble.
Inspect f or excess heating of engine and if found it same;
6- 1. Excess carbon deposit in combustion chamber
6-2.
6-3 .
In ferior grad e of fuel is used
Slippery clutch
6-4. Le an air-fuel mixture; i mp r oper size of main ie! in carburetter
6-5. Dirty cy l inder and cylinder head
Check for the engine de ve loping or knocking when it submit to quick acce rera -
tion or successive running at high speed a nd if it is so; The probable causes
are same as No. 161.
17 8
3,
Engine runs erratic and / or with miss firing
II I
12 1
Adjust air screw of carburetter properly and
still ru ns under same
I-I.
Fa ulty ignit ion timing
1-2.
1 -3.
1 -4.
D amaged corbur etter insulator Or k
pac ing
Faulty spark pl
ug
Fa ulty condenser
1 -5 . . F aulty i gnition coi l
1-6.
1-7.
Faulty contact br eaker point
I ncorrect t appet clearance
Circ um stances.
Che ck for missing at high speed
2-1 . Insufficient supply of fuel
and
if the engine , 's t'll d
s, un er the same.
2-2.
2-3.
2-4.
I ncorrect valve timing
Damaged or weak valve springs
Other causes mentioned in No. II I
4_
Excessive 'I
0' con sum p tio n or exhaust blue or black smoke
5.
6,
II I If the . h
engine ex ous ts smok e while continuous
running at high or l ow RPM.
121
I -I. Worn cy linder or piston ri ngs
1 -2 .
1
-3.
Reve rs ely assembled ri ngs in piston
Excess clearance b etween
exhaust valve and guide
If the engine exh t k
aus s
sma e just after when clos,'ng h I
t ro tt e valve suddenly from
certa in opening i
2-1.
2-2.
Excess clearance between inlet valve and guide
Clogged air vent hole Or plastic tube
Clutch jerks or engages un s moothl y
III If the machine moves fT h
a
wit jerking or the eng',ne sto t th
ps a e moment when
th e clutch engaged.
I-I.
1-2.
1- 3.
Uneven tensions
of clutch s pr ings
Distorted clutch plates
or facings
Sticky m
ove ment of clutch plate' h I
,n t e c utch outer
Gear shifting doe s not operate correctl y
III
When the changing gea r does
not engage.
I-I. Worn n otch on th e shift drum
1-2 . ' Stuck shift fork to the shift drum
1
-3. Worn shift fo rk
1 79
" .