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Screw the flywheel nut without locking it so that the crankshaft can
rotate in the flywheel. Screw the dial gauge support into the spark plug
hose, insert the dial gauge and move the piston to the top dead centre.
Now reset the dial gauge and rotate the crankshaft ant-clock wise of 3,7
mm towards the flywheel sense (see arrow in photo 13).
Once achieved the value, keep the pulley or the crankshaft stopped
using one hand and tight the flywheel nut using a key, without excee-
ding. Check that the advance timing is as indicated (3,7+/- 0,1), re-
move the m.5x30 screw and fit the coil. Before locking it with the 2
screws, place between coil and flywheel one 0,35 mm calibrated shim
(photo 14).
Now definitely tight the flywheel nut using a torque wrench at 40Nm.
(Photo 15)
17- TEMPERATURE THERESHOLDS
Your engine is equipped with a thermocouple to read the water
temperature to which it is possible to connect a specific instrument
(928.830.003) that detects the water temperature, the rpm and the
operation hours (not supplied) (Standard operating temperatures:
ENGLISH
min. 55°C., max. 95°C.)
If you use the engine in cold weather conditions and the water tempe-
rature does not reach the minimum one of 55° we suggest you should
install a thermostat with 60° opening (code 928.830.009).
18- ENGINE FITTING ON THE FRAME
13
Fix the engine on the frame using the two h. 45 aluminium spacers
supplied which must be positioned in the bottom. Fit the spark plug on
the head and the water connection with the two screws and OR provided.
Connect the fuel pipe to the tank. To prevent any residue of dirt ente-
ring the carburetor it is recommended to put an immersion fuel filter
(not supplied). Furthermore connect a breather pipe from the reservoir
system to the tank. Rotate the filter case and fix it firmly to the frame
using the proper connections.
19- FUEL LINE
Fuel line is a very important engine part; it has to avoid any possible
air infiltration. It is recommended using fuel pipes and high quality
immersion fuel filter. It is important to install the fuel pump vertically to
make the exit of the air bubbles easier. Complete the fuel line by fixing
all the pipes with proper clamps and test the system.
!
CAUTION: air infiltrations cause lean carburetion (lean fuel/
air mixture) thus leading to malfunctioning, between them damages
14
to the piston!
!
CAUTION: it is categorically forbidden the use of any kind of
quick-fit!
20- COOLING SYSTEM
We recommend you should install the radiator in the higher side than
the cylinder (photo 16).
15
Fix the big bracket supplied between the two vibration-dumping
mountings at the top and the frame. Fit the two rubbers on the bracket
and place the radiator. To fix the radiator in the top side a bracket and
a rubber are provided.
Cut to size the water pipes and mount them. Close the supplied clamps
using special pliers for its fitting (photo 17).
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