Lubrication System - Honda ST50 Shop Manual

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Fig.ID
3.2 Lubrication System (Oil Pump)
Description
The engine oil from by the trochoid pump is di-
verted into two routes. (Fig. 8)
Route one:
Oil Is seot through the r:lgbt
crankcase-,.rigbt crank-
case cover--+Cetltrifuga] ltff--+eonnectiog rod
large end rollers.
Route two:
Oil is sent through
the
cylinder stud bolt-+rocker
arm side cover-camshaft profiles and bearing-,.
vaJvemecbanlsm .
Disassembly
I. Unscrew the right crankcase cover mounting
screws the cover.
2. Remove the clutch outer cover.
3. Unscrew the 14 mm clutch lock nut and
wa-
sher. Remove the clutch a~scmbly.
4. Loosen the three 6 mm oil pump mounting
bolts and remove the oil pump assembly.
S. Loosen the three cross screws attaching the
oil pump cover. The oil pump can then
be
disassembled(Fig. 9) •
""""'"
I. Tum the oil pump drive shaft by hand to
make sure it turns smoothly.
2. Measuring the clearance between the outer
rotor and the pump body.
Insert the thickness gauge between the ou1er
rotor and lhe pump body
{Fig.
10).
Standard Value
0.10-0.u
{0.004-0.006}
mm(incb)
Serviocabk!Dinlt
RepilceifoveT"
0.20 (0.0079)