4 STROKES
OIL CIRCUIT (ALL 250Fi)
The delivery pump (1) suctions the engine oil through the plastic mesh
filter (2) from the primary gearbox-transmission compartment (3),
which also serves as an oil sump. The oil is pushed under pressure
through a duct (4) to the cartridge filter (5) where it is cleaned of any
impurities. Part of it is then pushed to the engine shaft and the other
part to the distribution.
The oil sent to the engine shaft enters the shaft duct and lubricates the
connecting rod head bearing (6).
The oil sent to the distribution goes up to the top of the crankcase and
branches further before accessing the cylinder.
A part of it is directed to the foot of the connecting rod (7), through a
nozzle, to lubricate the piston pin.
The other part is channelled along the cylinder and, via specific holes,
arrives at the nozzles that lubricate contact points 8 and 9 between the
cams and rockers and between the rockers and valve pads.
All the oil pushed under pressure to the main engine components is
taken to the point where the draining pump (10) recovers it and sends
it back to the gearbox-transmission compartment, due to gravity and
negative pressure. Oil circulates only in channels obtained inside the
engine. No external pipes are required.
OIL CIRCUIT (ALL 450Fi+F - ALL 530F)
The delivery pump (1) suctions the engine oil through the metal mesh
filter (2) from the oil sump (3). The oil is pushed under pressure through
a duct (4) to the cartridge filter (5) where it is cleaned of any impurity.
Part of it is then pushed to the engine shaft and the other part to the
distribution and gearbox.
The oil sent to the engine shaft enters the shaft duct and lubricates the
connecting rod head bearing (6).
The oil sent to the distribution and gearbox goes up to the top of the
crankcase and branches further before accessing the cylinder. A part
of it is channelled towards the gearbox, through the distributor (10), to
lubricate the gear teeth.
A part of it is directed to the foot of the connecting rod (7), through a
spraying nozzle, to lubricate the piston pin.
An additional part is channelled along the cylinder and, through specific
holes, it arrives at the smooth camshaft bearings and to the contact point
between the cams and cups (8 and 9).
All the oil pushed under pressure to the main engine components is
taken to the point where the draining pump (11) recovers it and sends it
back to the oil sump, due to gravity and negative pressure.
Please note that the oil sump is separated from the rotating compo-
nents of the engine (e.g. dry casing) and integrated in the casting of the
crankcase. Moreover, oil circulates only in channels obtained inside the
engine. No external pipes are required
.
ENGINE OIL
Only use high quality engine oil, such as SAE 10W-50, which corresponds
to or exceeds the standards of classes API SM, JASO MA2.
“VROOAM 4T 10W-50 100% Synthetic” oil is the only one used and rec-
ommended by TM Racing.
WARNING
AN EXCESSIVELY LOW LEVEL, LOW QUALITY OIL OR LONGER MAINTENANCE
INTERVALS THAN SCHEDULED CAUSE SERIOUS DAMAGE TO THE ENGINE.
4.3 ENGINE MAINTENANCE
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