Head Assembly - TOP Perfomance 9930000 Manual Del Usuario

CYLINDER AND PISTON ASSEMBLY
– Fit the roller cage in the con-rod small end after having abundantly
lubricated it with fully synthetic mixer oil.
– Fit one of the two gudgeon pin circlips (5) on the piston (2), lubricate
the piston ring groove and carefully fit the piston ring. If present, be
careful to fit the piston ring with the inscription "TOP" towards the
piston crown. Check that the piston ring enters completely into its
seat slightly pressing with the fingers to confirm a correct assembly.
– Fit the piston (2) ensuring that the arrow at the top points to the
cylinder exhaust port. Insert the well-lubricated pin (4) from the side
where the locking pin has not yet been fitted.
– Fit the second gudgeon pin circlip (5) and check for both of them
being correctly positioned in their seats, without any clearance
between them and their seats.
– Fit the cylinder base gasket (7).
– Lubricate the cylinder barrel (already washed and blown with air).
– Position the gudgeon pin circlip opening at the suitable retainer,
push the gudgeon pin circlip inside the groove and carefully insert
the lubricated cylinder fully home on the base gasket.
– Manually turn the crankshaft two or three times (holding the cylinder
with your free hand) to ensure engine is correctly assembled. Check
that the piston does not interfere with any part of the engine crankcase.
In case of interference, remove excess material from the crankcase
while protecting the opening from removed material and refit piston
and cylinder as previously described.

HEAD ASSEMBLY

– Fit the head gasket (8) and the head (6) on the stud bolts fully home
on the cylinder.
– Tighten the head nuts in a cross pattern and in several steps to a
torque of 14±1 Nm (approx. 1.4±0.1 kgm).
– Fit cover on cylinder (modified as shown in Fig. 3), conveyor and
the new spark plug (see section "Important notes").
REED VALVE
– Remove valve from old cylinder and refit it on the new cylinder
together with the supplied gasket (9).
– Make sure the reed valve is in perfect conditions Anyway, it is
recommended to replace it with the TOP PERFORMANCES
(cod. 9906520) valve with carbon fibre flaps, to solve reliability
problems that increased engine power may cause.
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