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2A.10
Air-cooled two-stroke engine
16 On models fitted with a cable operated
pump, bleed the pump (see Step
la),
then
install the cable bracket and the pump
mounting bolts, and tighten the bolts to the
torque setting specified at the beginning of
this Chapter. Connect the cable to the pump
pulley and check the operation of the cable
(see Chapter 1).
Caution: Accurate cable adjustment i s
important to ensure that the o i l pump
delivers the correct amount o f o i l t o the
engine and i s correctly synchronised with
the throttle.
13.5 Remove the wave washer
13.8 Mounting nuts (arrowed) locate in
17 On models fitted with a centrifugal pump,
slots in casing
install the pump mounting bolts and tighten
them to the specified torque setting,-then
6 Stuff a clean rag into the crankcase
for the pump. If it is damaged, or, if after
bleed the pump.
opening to prevent dirt falling inside.
bleeding the operation of the pump is
7 Remove the O-ring from the pump body
suspect, replace it with a new one.
Bleeding
and discard it as a new one must be fitted on
reassembly.
8 If required, remove the two nuts from the
underside of the pump mounting on the
crankcase for safekeeping (see illustration).
9 Ensure no dirt enters the pump body and
clean it using a suitable solvent, then dry the
pump thoroughly.
Installation
18 Bleeding the pump is the process of
removing air from it and allowing it to be filled
with oil. First ensure that the inlet hose from
the oil tank and the oil filter are completely
filled with oil. If necessary, detach the hose
from the pump and wait until oil flows from the
hose, then reconnect it.
19 Loosen the bleed screw on the pump and
wait until oil, without any air mixed with it,
flows out the hole, then tighten the screw (see
illustrations).
20 Ensure the ignition switch is OFF.
Disconnect the oil outlet hose from the
carburettor and crank the engine with the
kickstarter until oil, without any air mixed with
it, flows out the hose, then reconnect the hose
and secure it with the clip. Alternatively, fill an
auxiliaw fuel tank with a 2% petrol/two-stroke
12 If removed, install the two nuts on the
underside of the pump mounting (see
illustration 13.8).
13 Install a new O-ring on the pump body
and lubricate it with a smear of grease (see
illustration).
14 Remove any rag from the crankcase
opening and apply a smear of suitable sealant
around the chamfered outer edge. Install the
wave washer, then install the pump, ensuring
the tab on the back of the pump engages with
the slot in the drive shaft (see illustration).
15 If removed, fit the heat-proof sheath over
the oil inlet and outlet hoses, then connect the
hoses to the pump unions and secure them
with the clips (see illustration).
Inspection
10 Check the pump body for obvious signs
of damage especially around the mounting
bolt holes. Turn the drive tab by hand and
check that the pump rotates smoothly. Where
fitted, check that the cable pulley turns freely
and returns to rest under pressure of the
return spring.
1 1 No individual components are available
oil mix and connect it to the carburettor.
Disconnect the oil outlet hose from the
carburettor, start the engine and run it until oil,
without any air mixed with it, flows out the
hose, then reconnect the hose and secure it
with the clip.
A
Warning: Never run the engine
without an oil supply o r crank the
engine on the electric starter
without an o i l supply. Never crank the
engine with the ignition ON and the spark
plug cap disconnected from the spark plug
as the ignition system may be damaged.
L
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J
13.14 Ensure tab (A) locates in slot (B)
Fit a new pump body O-ring
13.15 Oil hoses must be secured by clips
13.19a Bleed screw on centrifugal oil
13.19b Bleeding a cable operated oil pump
(arrowed)
Pump
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