Cylinder Head And Valves - MOTO GUZZI Stornello sportcc Owner's Manual

spindle (F). A few drops of oi I will suffice as too much may
get on to the contact s.
There is no necessity of remov ing the flywheel as thi s ope-
ration can ea s ily be carried out through the webs .
Every 3000 kms. (1800 miles) it is a good ru Ie to check
the plug point s wh ich s ho uld be 0,6 mm. (.025") apart. If
the insulator is cracked o r broke n, replace the plug. To c lean,
use petrol and a w ire brush. When fitting the p lu g, ensu-re
it is started by han ds fo r a few turns to avoid possible
strippings o f the thread.
Compl ete this opera ti on us ing the plug spanner but be
careful no t to ove rtighte n as the thread might get s trained _
Examin e the co ndition o f th e h ig h tens ion cable from
magn eto p ic k-up to p lug _
Cylinder head and valves
Every 10.000 kms. (6000 mi les) the engine shou ld be
deca rbonised and if necessary the va lves ground in.
To re move th e cy lin der head, take off the carb ure tto r, ex haust
p ipe, rocke r box, rocke rs , a nd th e 4 ho ld in g d ow n nut s. Then
rai se th e petro l tan k ju s t s uffi cien t ly to a ll ow the cy linder
head to b withdra wn .
In carrying o ut thi s op rat ion, particular ca re s ho uld be
taken not to damage th e four rubber wash rs in their housing
in the head.
Ensure there are no valve leak ages by setti ng up the head
on a bench and pouring some petro l into each port to see if
any seeps through into the combustion c hambe r.
If the seats are defective, it wi ll be necessa ry to grind in
the valves and in such case th e valves w ill have to be
dismantled from the head .
To clean this latter and the ports, use a scraper and a
wire brush .
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