Dnepr MT9 Repair Manual page 16

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Troubl e
Engine overheats
Cnusc
3. Va lves do not fit close-
ly to their scats due to a ccu-
mulatio n of ca rbon deposits
4. Gases burst fo rth fr om
un der cy lind er head
5. Pi ston r ings burnt · or
broken
6. Cyl inders and pistons cx-
cess iYely worn
l. No oil or insufficient
amount of it in the crankca se
2.
Enri ched mixture:
a) ca rburettor overfi lle d
du e to float nee dle Ya lve be-
ing badl y seated ;
b) air clean er dirt y;
c) carburettor thrott le need-
le wrongly set
3. Diluted mi xture:
a) t hrottle needle in co rrect-
ly set;
b) a ir inl eakage at carbu-
rettor -t o-head junctions
4. Late ignition advance
Symptoms and iJul t lra cillR
3. Low compression is o b-
served
4. Bangs arc heard an d lo\\.
compression is obsen·ed
5. Low compression, eng in e
s m okes a nd splashes the
plugs wi th oil
6. To be checked a t main-
tenan ce shop
l. Check oil level
2. Engine fai ls to de\·elop
sufiicient speed:
a) check whether petrol
flows from float chamb 2r
(chamber overfilled)
a) eng ine, if und er load ,
fai ls to develop the proper
speed;
b) bangs in the ca rburet lor
Continued
Remedy
3. Repair t he engine. Clean
off carbo n and lap the va lves
tl. Tighten th e nuts secur ing
the hea ds lo cy linder
5. Repair the en gine. Clean
or replace th e rings
6. Repair th e engine. Repla -
ce or repai r the cy linders and
pistons at maintenance s hop
I. F
ill up w ith o il
2. Clean dirt from the float
chamber :
a) repair the carburetlor
1
.
and Ia p the needle va lve;
.. l./
b) remove the air clean er
and was h it;
c) adj ust the ca rburet tor
a) a dju s t the carburett or;
b) tighten the nuts secu ring
the carburettor to th e head.
If
in leakage continues to take
place, re place the
gasket.
Check the breaker gap .
Set the ignition