Allstate 788.94493 - Troubleshooting Engine and Running Issues; Diagnosing Difficult Starting; Resolving Incorrect Running Conditions

LOCATING TRO UBLES AND RUNNING IRREGUlARITIES
Carry out following checks when the engine do •• not start easily or runa irregularly.
INCORRECT BUNNING
DIF'FICULT STARTING
R.-hm.
S.. No. 2 of lhis paragraph
AdilUt (a .. Fig. 14. page 9)
Wash with gaaolin. or r.plac.
R.plac.
Clean with pure gasoline and
blow dry. DIp the m.tal wad-
ding inlo a 30% gasolln,-011
bath
R.l.as. operating and lubn-
callnq the I.v.r on lhe back
o( the c1.aner eale
fit proper jet <.63 mm)
Replac.
Clean or r.plae. both needle and
floal chamber cov.r
I
I
:ar. !
Lubricat. or, if nec.asary, re-
p:ac.
AdllUt
become. I
col_
4. • Clutch trouh!' ••
Locating the trou~_le' __ '_I Remedies
I
a) Clutch snatchel: I
Ext.rnal steel plate wrongly I Turn convex bee towards plates
assembled . . I Wilh cork
Gear pinions not lubrlcaled j Top up oil level. Tighten the
properly , screw on draining hole
bl Clutch llips:
Springs leable Rep~ace
Plates with cork worn or burnt Replace both plales and springs
c) Clu:ch does not disengage
compl.lely :
ExceSlive play on control Adjust
cable
ExceSilve conv.xity of Ileel Replact.
plat.l.
tx.uiv. play
50 • High ha.l COIIaWDplioD
I • Fu.l l.v.l too high in
bur.llor:
a) noat perlorated
b) noat n.edl. valve not
properly hlling into ill
•• ating
II • Air cleaner chok.d or dirty
S •• GaClr piDiolU cli •• 1l9C19. of
OWIl a~~orci
Gear cnange conirol cabl.1 out Adiusl
01 ad,lUtm.nt
Spring of .tilT\lp broken, le.bl. Replace
or miumg
Exc.ssive play belw .. n actuat- Replace
ing ann and g.ar ahift llanoe
or wrong positioning of the
arm.
Sel.ctor annl chaml.red Replace 'lhe selector
Dog. of g.ar pinionl chipped or : R~plac. the pinionl
worn '
7 •• CoDuola _t opeJ'ClUD9 pro-
peri,
Inn.r cabl.. rlUted
m • nap of choke valve lticking
in cloa.d or partially c1e.-
ed polltlOn
IV - Diam.t.r of main j.l orihce
wrong or increaaed
V • R.tard.d ignition
VI • Poor compr.uion.
... SteeriD9
atiJf
Top rac. of top ball bearing Slack.n
too .tight
Bottom rac.. of the two ~- Replac.
ing. pitted
1 Q. • p_ bralI:iD9
Stroke of ~ or l.ver too 1000g
Brake lininga oily or wom down
Brait. cirwna and lininga aerat-
checl
I .. Eac.ui.. play of .... riDg
collUDD
Top rac. 01 top bearing loos. Tighten
Remedies
R.-time ignition
S .. page 7
R.plac.
Clean (s.e page 10)
R.I.cae
R.I.a.e
Turn (0 • reserve •. Refill as soon
as possible.
aJ Unscr.w and remove the
mam ,et. II Ihe luel system i~
elhclent, tuel will come out.
b) B10." Irough ,et orifice 10 en-
sure that it IS clean.
Remove and wash in gasoline -
Blow
dry
Diaconn.ct Ihe plug lead. Check
if sparking oc:urs b.tween
lead and erankcae when Ihe
kicutart.r is operat.d.
Clean. Correct gap 10 .6 mm.
(.023-)
Replace th. plug
Clean with .uitabl. file. or v.ry
.tin •• m.ry paper
Correct 10 .4 mm. with I •• l.r
gaug. (.OlS-)
R.place
Tight.n (21 mm box wr.nch)
Clean the ringa and groov ..
Set the bead properly and tigh·
t.n the nUll
R.p1ace or c1.an the plug and
corr.ct th. gap to 0.6 mm <.023-)
Clean
0) FIt CD a cald.r aparkplug
b) Re·tim. the ignition
R.p1ac.
Tigbl.n
Ie s.. paragrapb • Dillieu1t atart·
ing., No. I
Locallng the
trouble
1 •• F'lIel .y.lem
fu.1 tank empty
fuel does not now to Ihe cClTbu-
rettor all hough the luella;) is
open or In position • r.serve •
filler on carburetlor (
fuel tap body
Carburettor body Clogg.d,
Main lei \ diTlY
Atomizer
Packing of fuel tap I
float needle valve sticking on ill
seating
1. • CMkllUCltiOIl
Engin. llooding
float perforated
Air cleaner chok.d or dirty
Choke !lap Iticking in position
• closed.
3. • lpi tiOll
Sparkplug dirly
Pore.lain of lparkplug crack.d
Break.r poi nil dirty, partially
worn or pitted
Gap betw.en break.r poinl. in·
correct
Br.ak.r points complet.ly worn
or pitl.d
Timing wrong
1 .• Lack of pow.r I
Muli.r outl.1 pipe carbonized I C1.an (I" page 10)
Induction pipe 10 cylind.r loose Replace the packJng betw •• n
Pipe and cyli"\d.r. Tlghlen
lb. null on CYllnd.r Iluda.
Deearbonize cylind.r, pi.ton
and cyllnd.r head
R.plac.
Exhauat port partially closed by
carbon d.poait
Cylind.r ba.. gcak.t not tight
Sr-arking plug carbon-eoat.d or
wllh 'XC'Sll'r' .leclrod. gap
Carbon peoria on .parkplug in·
'1Ilation
Pre-ignition
Tip 01 ~ntact break.er 100M
Cond.naer aer.w 100M
Nol .nough mixture Dowing
the earbur.lIor
1. • P_r ~omJWeouiclia
Spark plug not w.ll aer.wed
down in cylind.r beacI
Cylind.r head not titting properly
into th •• pigot on tot> 01 cy.
lmd.r
Pi.ton rings gummed up
3 .• Exploaiou ClI .WIl.r or car·
bllT.llol
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