CONTENTS

FUEL SYSTEM ............................................................. 6s 1

FUEL COCK ................................................................. 6- 2

FUEL PUMP ................................................................ .6- 3

CARBURETOR .............................................................. .6_ 4

CARBURETOR CONSTRUCT/ON ................................ .6- 4
SPEC/F/CA T/ONS ..................................................... .6_ 6

I.D. NO. LOCA T/ON ................................................... 6- 8

DIAPHRAGM AND PISTON OPERATION .....................6 - 8

SLOW SYSTEM ..................................................... .6_ 9

TRANSIENT ENRICHMENT SYSTEM...........................6 - 9

MAIN SYSTEM ........................................................ .6_fO

STARTER SYSTEM .................................................. .6_11

FLOAT SYSTEM ..................................................... .6_11

REMOVAL .............................................................. .6-Q

DISASSEMBL Y ........................................................ .6-Q

NEEDLE VALVE INSPECTION ................................... .6_13

FLOAT HEIGHT ADJUSTMENT ...... ......................... .6_13

REASSEMBLY AND REMOUNTING ... ......................... .6_14

BALANCING CARBURETORS ......... ......................... .6_15

LUBRICATION SYSTEM ....................... ......................... .6_17

O/L PRESSURE. ............................. ......................... .6_17
OlL FILTER .................................... ......................... .6_18

OIL SUMP FILTER ........................ ........................ ..6_18

LUBRICATION SYSTEM CHART ...... ......................... .6_19

6-1 FUEL AND LUBRICATION SYSTEM

FUEL SYSTEM
A vacuum operated fuel pump is used to supply fuel from the fuel tank to the carburetor. The pump is
necessary as the fuel cock is mounted lower than the carburetor fuel bowl. In addition, the pump assures
an adequate supply of fuel to the engine under the steepest climbing conditions as well as while running
across rough terrain.

No. 2 carburetor

Fuel

Fuel pump
 FUEL AND LUBRICATION SYSTEM 6-2

FUEL COCK
A valve is provided at the top of the fuel cock lever and can switch over to “OFF”, “ON” and “RES”.
With the valve “ON” (normal), the main passage opens. With the valve “OFF”, both holes close.

“ON” position “RES” position

“ON”

WARNING:
Gasoline is very explosive. Extreme care must be taken.
Gaskets must be replaced with new ones to prevent fuel
leakage.

INSPECTION AND CLEANING

If the fuel strainer is dirty with sediment or rust, fuel will not
flow smoothly and loss in engine power may result. Clean the
fuel strainer with compressed air.
6-3 FUEL AND LUBRICATION SYSTEM

FUEL PUMP
Vacuum pulsations from the carburetor intake tract are used to operate the pump diaphragm. When
vacuum is applied to the diaphragm, fuel is drawn from the tank into the diaphragm’s chamber. As positive
pressure is applied, the spring forces the diaphragm back, pushing the fuel through the outlet to the
carburetor.
A series of check valves is used in the fuel flow route to allow the fuel to move in only one direction,
through the pump body.

Fuel from fuel cock

Negat :ive

Fuel to carburetor

Positive 1

FUEL PUMP INSPECTION

In case of fuel leak at fuel pump or air leak into the fuel line,
check the following items:
* Broken diaphragm
* Malfunction of check valve
* Loose screws on fuel pump
If any defect is found, replace the fuel pump assembly with a
new one.
 FUEL AND LUBRICATION SYSTEM 6-4

CARBURETOR
CARBURETOR CONSTRUCTION

No. 2 (FRO INT) CARBURETOR

@ Jet needle stopper plate

(‘$ Syncronizing cable @ Main jet
@ Throttle valve @ Spacer
@ Main jet holder
@ Throttle valve shaft @ E-ring
8 Pilot jet
return spring @$ Jet needle
@$ Starter plunger
@ Washer
@ Balance screw
@$ Coasting valve @$ Spring
0 Needle valve @ Piston valve
0 Fuel hose
@$ Needle jet
@$ Breather hose
@ Carburetor top cap
@ Seal ring @$ Piston valve spring
6-5 FUEL AND LUBRICATION SYSTEM

No. 1 (REAR) CARBURETOR

@ Fuel hose 0 Pilot jet @ Breather hose

@ Coasting valve @ Balance screw @ Jet needle stopper plate
@ Drain screw @ Throttle valve @ Spacer
@ Gasket @ Throttle stop screw @ E-ring
@ Float pin @ Throttle valve shaft @ Jet needle
@ Float @I Throttle valve return spring @ Washer
0 Needle valve 0 Pilot screw 0 Spring
@ Filter $$ Starter plunger @$ Piston valve
@ Main jet @& Fartburetor top cap @ Needle jet
@ Needle valve stopper screw IS on valve spring
 FUEL AND LUBRICATION SYSTEM 6-6

SPECIFICATIONS
CARBURETOR CARBURETOR

I SPECIFICATION SPECIFICATION
ITEM ITEM
E-02.04. 15,21,25,28,34 I E-33
Carburetor type MIKUNI MIKUNI Carburetor type MIKUNI MIKUNI
BS36SS (No. 1) BDS36SS (No. 2) BS36SS (No. 1) BDS36SS (No. 2)
Bore SIX 36 mm c Bore size 36 mm t

I.D. No. 45coo t I.D. No. 45C20 t

Idle r/min. 1100f100r/min. t Idle rlmin. 1200 + 50 rlmin. t

Float height 27.7fl.Omm 9.1 f 1 .O mm Float height 27.7 * 1 .O mm 9.1 + 1 .O mm

I1 -09 20.04 in) (0.36 f 0.04 in) (1.09 f 0.04 in) (0.36 f 0.04 in)
I

Main jet (M.J.) # 132.5 #I20 Main jet (M.J.) # 132.5 #/f?L?.i

Main air jet (M.A.J.) 1 .B mm t Main air jet (M.A.J.) 1.8 mm t

Jet needle (J.N.1 5FlOB-3rd 5D49-3rd Jet needle (J.N.1 5E73-1st 5D47-1 st
I

Needle jet (N.J.) 1 P-4 t Needle iet (N.J.) / P-q P-7_ t

Throttle valve (Th .V .) #115 c Throttle valve (Th.V.) #125 # 110
Pilot jet (P.J.) #47.5 #40 Pilot jet (P.J.) #Y #YU
By-pass (8.P.) 0.8 mm x 2PCS 0.8 mm x 3 PCS By-pass (B.P.) 0.8 mm x 2PCS 0.8 mm x 3PCS
Pilot outlet (P.0.) 0.8 mm 1 .O mm (P.0.) 1I.” n--11,111
Pilot outlet 0.8 mm
Valve seat W.S.) 1.5 mm t Valve seat (V.S.1 1.5 -- 11,111
t

Starter jet (G.S.1 # 25 # 22.5 Starter jet (G.S.) # cl=

L< # 22.5
7
Pilot screw (P.S.) (PRE-SET) (PRE-SET) Pilot screw (P.S.) (PRE-SE.1 r, I (PRE-SET)
l-3/8 turns back l-l/B turns back
I 1 Pilot air jet (P.A.J.) No. 1: (# 65). No. 1: (#65),
,.“. 7.
&. ,”
Pilot air jet (P.A.J.) No.1 : (# 70). No.1 : (# 65). Tlrr hln ,? ~___(
I II, \L.U mm) No. 2: (1.2 mm)
No.2: (2.0 mm) No.2: (I .2 mm)
Throttle cable play 0.5 - 1 .O mm t
Throttle cable play 0.5 - 1 .O mm t (0.02 - 0.04 in)
I
(0.02 - 0.04 in)
Choke cable play 0.5 - 1 .O mm t
Choke cable play 0.5 - 1 .O mm t (0.02 - 0.04 in)
1 I
(0.02 - 0.04 in) L

CARBURETOR CARBURETOR
SPECIFICATION
ITEM
E-03
Carburetor type MIKUNI MIKUNI
BS36SS (No. 1) BDSSBSS (No. 2)
Bore size 36 mm t

I.D. No. 45ClO t

Idle r/min. 1200 + 50 rlmin. c

Float height 27.7fl.Omm 9.1 * 1 .O mm

(1.09 * 0.04 in) (0.36 * 0.04 in)
Main jet (M.J.) # l3Z i # ir_‘? i
Main air iet (M.A.J.) 1.8 mm t

Jet needle (J.N.) 5E72-1 st 5D47-1 st

Needle jet (N.J.1 P-7 p r‘

Throttle valve (Th .V .) #I25 # 110

Pilot iet 1P.J.) #Yi #YU

By-pass (B.P.) 0.8 mm x 2PCS 0.8 mm x 3 PCS

Pilot outlet (P.0.) 0.8 mm 1.0 mm

Valve seat (V.S.1 1.5 mm t

Starter iet (G.S.) #25 #22.5

No. 2: (1.2 mm)

Throttle cable play 0.5 - 1 .O mm t
(0.02 - 0.04 in)
Choke cable play 0.5 - 1 .O mm t
(0.02 - 0.04 inl
6-7 FUEL AND LUBRICATION SYSTEM

CARBURETOR CARBURETOR

I
SPECIFICATION SPECIFICATION
ITEM ITEM
E-01,16 U-woe of E-22
I
I

Zarburetor type MIKUNI MIKUNI Carburetor type MIKUNI MIKUNI

BS36SS (No. I) fBDS36SS (No. 2) BS36SS (No. I) BDS36SS (No. 2)

Bore size 36 mm t

I.D. No. 4x40 t

Idle rlmin. 1100f100r/min. t

Float height 27.7fl.Omm 9.1 + 1 .O mm

(I .09 kO.04 in) (0.36 k 0.04 in)

Main iet fM.J.1 1

/ ni 135 # 122.5 II fM.J.1 k 122.5

Main air jet (M.A.J.) 1.8 mm t (M.A.J.) t

Jet needle (J.N.) 5Fl OS-3rd 5D49-3rd fJ.N.1 5D49-3rd

Needle jet (N.J.) P-4 t (N.J.) P-6

Throttle valve (Th.V.) #I15 t Thrnttle valve fTh.V.l I #I15 t -

PIlot jet (P.J.) rry47.5 #40 Pilot jet fP.J.1 1 j: 47.5 #40

Bypass (B.P.1 0.8 mm x 2PCS 0.8 mm x 3PCS Bypass (B.P.) 1 0.8 mm x 2PCS 0.8 mm x 3PCS

Pilot outlet (P.0.) 0.8 mm 1 .O mm I Pilot outlet fP.0.) I 0.8 mm I 1.0 mm I

(V.S.1 1.5 mm t Valve seat (V.S.) 1.5 mm t
Valve seat
Starter jet (G.S.) f 25 # 22.5 Starter jet (G.S.) ti 25 # 22.5

Pilot screw (P.S.) (PRESET) (PRESET) Pilot screw (P.S.) (PRESET) (PRESET)
l-l /2 turns back l-l /8 turns back 1 -l/8 turns back l-l/16 turns back)

Pilot air jet fP.A.J.1 No. 1: (3-f70). No. 1: (# 651,

__::::_‘ Throttle cable play

No. 2: (2.0 mm)
0.5 - 1 .O mm
(0.02 - 0.04 in)
No. 2: (I .2 mm)

Choke cable play 0.5 - 1 .O mm t

(0.02 - 0.04 in)
I

CARBURETOR CARBURETOR
SPECIFICATION
ITEM +Sf=$$;N ITEM
E-17
1 Carburetor tvpe I MIKUNI I MIKUNI Carburetor type MIKUNI MIKUNI
BS36SS (No. I) BDS36SS (No. 2) BS36SS (No. I) BDSBBSS (No. 2)
Bore size 36 mm t t
Bore size 36 mm
I.D. No. 45050 t I.D. No. 45070 t
1 Idle rimin. 11100~100r/min. I t Idle rlmin. 1100 * 100 r/min. t

Float height 27.7 f 1 .O mm 9.1 i- 1 .O mm

(I .09 * 0.04 in) (0.36 f 0.04 in)
Main jet (M.J.) 1 #I35 # 122.5
Main air jet (M.A.J.) j 1.8 mm t

Jet needle (J.N.) / 5Fl08-3rd 5D49-3rd

I Needle iet (N.J.) / P-4 I + Needle jet (N.J.) / P-4 P-6 1
I Throttle valve fTh.V.) 1 #I15 I t Throttle valve fTh.V.) / #I15 I + I
Pilot jet (P.J.) 847.5 #40 Pilot iet (P.J.) / # 47.5 I/ # 40 I1
By pass (B.P.) 0.8 mm x 2PCS 0.8 mm x 3PCS By-pass (B.P.) 0.8 mm x 2PCS 0.8 mm x 3PCS
Pilot outlet (P.0.) 0.8 mm 1.0 mm Pilot outlet fP.0.) 0.8 mm 1 .O mm
Valve seat (VS.) j 1.5 mm t Valve seat (VS.) 1.5 mm t
Starter iet 1G.S.) 1 #25 #22.5 Starter iet (G.S.) #25 # 22.5
Pilot screw (P.S.) (PRESET) (PRESET)
l-3/8 turns back l-114 turns back

Pilot air jet (P.A.J.) No. 1: (# 70), No. 1: (# 65).

No. 2: (2.0 mm) No. 2: (I .2 mm)
Throttle cable play 0.5 - 1 .O mm Throttle cable play 0.5 - 1 .O mm
t t
(0.02 - 0.04 in) (0.02 - 0.04 in)
Choke cable play 0.5 - 1 .O mm Choke cable play 0.5 - 1 .O mm
t t
(0.02 - 0.04 in) (0.02 - 0.04 in)
 FUEL AND LUBRICATION SYSTEM 6-8

I.D. NO. LOCATION

Each carburetor has I.D. Number 0 stamped on the carbure-
tor body according to its specifications.

DIAPHRAGM AND PISTON OPERATION

The carburetor is a variable-venturi type, whose venturi cross section area is increased or decreased auto-
matically by the piston valve @ which moves according to the negative pressure present on the down-
stream side of the venturi @I. Negative pressure is admitted into the diaphragm chamber @ through an
orifice @ provided in the piston valve 0.

Rising negative pressure overcomes the spring @ force, causing the piston valve @ to rise to increase the
said area and thus prevent the air velocity from increasing. Thus, air velocity in the venturi passage is kept
relatively constant for improved fuel atomization and for securing optimum ratio of fuel/air mixture.

I Negative pressure
6-9 FUEL AND LUBRICATION SYSTEM

SLOW SYSTEM
This system supplies fuel during engine operation with throttle valve @ closed or slight opened. The fuel
from float chamber @ is metered by pilot jet 0 where it mixes with air coming in through pilot air jets
(#I and #2) 0. This mixture, rich with fuel, then goes up through pilot passage to pilot screw 0. A part
of the mixture is discharged into the main bore out of by-pass ports 8. The remainder is then metered by
pilot screw @ and sprayed out into the main bore through pilot outlet 0.

TRANSIENT ENRICHMENT SYSTEM

This transient enrichment system is a device which keeps fuel/air mixture ratio constant in order not to
generate unstable combustion when the throttle grip is returned suddenly during high speed driving. For
normal operation, joining of the air from upper part of carburetor inlet side to pilot air passage obtains _
proper fuel/air mixture ratio. But if the throttle valve is suddenly closed, a large negative pressure generat-
ed on cylinder side is applied to a diaphragm. The valve @ which interlocks with the diaphragm closes an
air passage, thus, the pressure flows out to the pilot air passage.
This is system to keep the combustion condition constant by varying the fuel/air mixture ratio by control-
ing air flow in the pilot circuit.

Pilot jet @q

Fuel/Air mixture

s Fuel
 FUEL AND LUBRICATION SYSTEM 6-10

MAIN SYSTEM
As throttle valve @ is opened, engine speed rises, and this increases negative pressure in the venturi @.
Consequently the piston valve @ moves upward.
Meanwhile, the fuel in float chamber @ is metered by main jet 0, and the metered fuel enters needle jet
0, in which it mixes with the air admitted through main air jet @to form an emulsion.
The emulsified fuel then passes through the clearance between needle jet @ and jet needle 0, and is
discharged into the venturi @, in which it meets main air stream being drawn by the engine.
Mixture proportioning is accomplished in needle jet 0; the clearance through which the emulsified fuel
must flow in large or small, depending ultimately on throttle position.

..../....:..
..&$:~~~~~$& ::::,
,...,
Throttle ‘.:$$$:.:.:..“ . . . . . . .,....:,:.: :.:“,B

,:::;::I :. “::?:: ,..,

valve (Q
Fing jet

Q
.-.. w-w-- - -_ -_ -_
--e---_ __- 0
o-
@

\ I Air

Fuel/Air mixture

\
Main int m
6-11 FUEL AND LUBRICATION SYSTEM

STARTER SYSTEM
Pulling up the starter shaft 0, fuel is drawn into the starter
circuit from the float chamber 0.
Starter jet @ meters this fuel, which then flows into starter
pipe @ and mixes with the air coming from the float chamber
@ . The mixture, rich in fuel content, reaches starter plunger
@ and mixes again with the air coming through a passage
extending from main bore.
The two successive mixings of fuel with air are such that
proper fuel/air mixture for starting is produced when the
mixture is sprayed out through starter outlet @ into the main
bore.

FLOAT SYSTEM
Floats @ and needle valve @ are associated with the same
mechanism, so that, as the floats 0 move up and down, the
needle valve @ too moves likewise.
When fuel level is up in float chamber 0, floats @ are up and
needle valve @ remains pushed up against valve seat. Under
this condition, no fuel enters the float chamber 0. As the fuel
level falls, floats @ go down and needle valve @ unseats itself
to admit fuel into the chamber 0.
cr) ( \ /-fj carwretor
In this manner, needle valve @ admits and shuts off fuel alter-
nately to maintain a practically constant fuel level inside the
float chamber 0.

eedle valve
0

lump I
 FUEL AND LUBRICATION SYSTEM 6-12

REMOVAL
0 Refer to page 3-3.

l Remove the No. 1 and No. 2 carburetors along with the

synchronizing cable 0 attached to the carburetors.

CAUTION:
Be sure to identify each removed parts as to its location, and
lay the parts out in groups designated as “No. 1 carburetor”,
“No. 2 carburetor”, so that each will be restored to the
original location during assembly.

No. 2 (FRONT)

@ : Syncronizing cable
@ : Syncronizing cable adjuster
@$ : Throttle cable (No. 2 carb.)
@ : Throttle cable adjuster (No. 2 carb.)
0 : Throttle cable (No. 1 carb.)
@ : Throttle cable adjuster (No. 1 carb.)
8 ; TrottIe stop screw
crew
0 : Fuel hose

NOTE:
Do not turn the throttle cable adjusters @I , @ and the synchronizing cable adjuster @I .

CAUTION:
Do not turn the screw 0 of the No. 2 carburetor.
Once removing a throttle cable or the synchronizing cable or a carburetor body, it is necessary to balance
the two carburetors.

DISASSEMBLY
l Disassemble the carburetors as shown in the illustrations on pages 6-4 and 5.
6-13 FUEL AND LUBRICATION SYSTEM

Check following items for any damage or clogging.

* Diaphragm
* Pilot jet
* Gasket
* Main jet
* Throttle valve shaft oil seals
* Main air jet
* Pilot outlet and by-pass holes
* Pilot air jet
* Fuel hose
* Needle jet air bleeding hole
* Coasting valve
* Float
-
* Needle valve mesh and O-ring * Starter jet

NEEDLE VALVE INSPECTION

If foreign matter is caught between the valve seat and the
needle, the gasoline will continue flowing and cause it to over- -

flow. If the seat and needle are worn beyond the permissible
limits, similar trouble will occur. Conversely, if the needle
sticks, the gasoline will not flow into the float chamber. Clean
the float chamber and float parts with gasoline. If the needle is
worn as shown in the illustration, replace it together with
available seat. Clean the fuel passage of the mixing chamber
with compressed air.

FLOAT HEIGHT ADJUSTMENT

To check the float height, invert the carburetor body, with the
float arm kept free, measure the height @ while float arm is
just in contact with needle valve by using calipers.

Float height @
I No. 1
I 27.7 f 1 .O mm
(1.09
. - f 0.04 in)
9.1 f 1.0 mm I
No. 2 REAR CARBURETOR
(0.36 f 0.04 in)

09900-20102 : Vernier calipers

FRONT CARBURETOR
Bend the tongue 0 as necessary to bring the height @ to this
value.
 FUEL AND LUBRICATION SYSTEM 6-14

REASSEMBLY AND REMOUNTING

Reassemble and remount the carburetors in the reverse order
of disassembly and remounting.
Pay attention to the following points:
l Align the groove @ of the needle jet with the pin @ and
replace it.

l Place the tongue 0 of diaphragm to the carburetor body

properly.

l When installing the coasting valve to the body, align the

holes.

l Set each throttle valve in such a way that its top end @
meets the foremost by-pass @I.
6-15 FUEL AND LUBRICATION SYSTEM

BALANCING CARBURETORS

No. 2 (FRONT)

: Synchronizing cable
: Synchronizing cable adjuster
: Throttle cable (No. 2 carb.)
: Throttle cable adjuster (No. 2 carb.)
: Throttle cable (No. 1 carb.)
: Throttle cable adjuster (No. 1 carb.)
: Throttle stop screw
: Screw
: Fuel hose
No. 1 (REAR)

CAUTION:
Once removing the synchronizing cable @ or throttle cables
@ , 0 or carburetors, it is necessary to balance the two
carburetors.

IN CASE OF CHANGING THE SYNCHRONIZING CABLE

@:
As the first step, calibrate the carburetor balancer gauge, as
follows:

09913-13121 : Carburetor balancer

09913-13140 : Adapter

Start up the engine and run it in idling condition for warm-

ing up.
Stop the warm-up engine. Remove the vacuum inspection
screw @ for No. 2 carburetor and install the adapter @
with gasket.
Connect one of the four rubber hoses of the balancer gauge
to this adapter, and start up the engine, and keep it running
at idle speed by turning throttle stop screw @I.

NOTE:
The idle speed is different among the countries. (See pages 6-6
and 7.)
 FUEL AND LUBRICATION SYSTEM 6-16

Turn the air screw @ of the gauge so that the vacuum act-
ing on the tube of that hose will bring the steel ball @ in
the tube to the center line 0.

After making sure that the steel ball stays steady at the
center line, disconnect the hose from the adapter and con-
nect the next hose to the adapter. Turn air screw to bring
the other steel ball to the center line. Now the balancer has
been calibrated.

Remove the vacuum inspection screw @ for No. 1 carbure-

tor and install the adapter with gasket.
Connect each calibrated balancer gauge hose to their respec-
tive adapters.

Warm up the engine, and keep it running at idle speed.

Under this condition, see if the two steel balls stay equally
at the center level line, as they should, to signify that the
two carburetors are in balance: if not, loosen the lock nut
and turn the synchronizing adjuster @I and the throttle stop
screw 0 to bring the steel balls to the center level line by
keeping the engine running at idle speed.

IN CASE OF CHANGING THE THROTTLE CABLE @, 0:

As the first step, calibrate the carburetor balancer gauge at
1500 r/min, as the same manners of the case of changing the
synchronizing cable.
l Temporarily remove the No. 1 carburetor.
l Equalize the throttle cables’ inner length at the connector
by turning the adjusters @I ,O after loosening the lock
nuts.

NOTE:
Be careful not to twist the throttle cables 0, 0.
Throttle cable adjuster @ can not be turned when the No. 1
carburetor is installed to the engine.
The idle speed is different among the countries. (See pages
6-6 and 7.)
6-17 FUEL AND LUBRICATION SYSTEM

Install the No. 1 carburetor and set the carburetor balancer

which is calibrated at 1500 r/min.
Warm up the engine, and keep it running at 1500 r/min by
turning the throttle grip.
Under this condition, see if the two steel balls stay equally
at the center level line, as they should, to signify the two
carburetors are in balance: if not, loosen the lock nut and
-
turn the throttle cable adjuster @ to adjust the throttle
valve setting to bring the steel balls to the center level line.

NOTE:
When equalizing the throttle cables’ inner length, make sure
that each throttle cable have enough play. -

IN CASE OF CHANGING THE CARBURETORS

When changing the carburetors, it is necessary to remove the
synchronizing cable and throttle cables. So once removing the
carburetor, it becomes necessary to adjust the cables by per-
forming above two steps (i.e. IN CASE OF CHANGING THE
SYNCHRONIZING CABLE and IN CASE OF CHANGING
THE THROTTLE CABLE).

CAUTION :
In this case first adjust the synchronizing cable.

LUBRICATION SYSTEM
OIL PRESSURE
Check the oil level in the inspection window and check the oil
pressure in the following manner:
Remove the oil pressure inspection bolt.
Install the oil pressure adapter 0.
Install the oil pressure gauge in the position shown in the
figure.
Warm up the engine as follows:
Summer 10 min. at 2000 r/min.
Winter 20 min. at 2000 r/min.
After warming up operation, increase the engine speed to
3000 r/min, and read the oil pressure gauge.
The oil pump pressure is specified below:

OIL PRESSURE SPECIFICATION

Above 350 kPa (3.5 kg/cm*, 50 psi)

Below 650 kPa (6.5 kg/cm*, 92 psi) at 3000 r/min
Oil temp. at 60°C (140” F)
 FUEL AND LUBRICATION SYSTEM 6-16

CAUTION:
The recommended engine oil is, API classification SE or SF,
low-40 motor oil.

0991574510 : Oil pressure gauge

09915-77330 : Oil pressure gauge (meter)
09915-74530 : Oil pressure gauge adapter

NOTE:
Engine oil must be warmed up to 60” C 1140” F) when check-
ing the oil pressure.

If the oil pressure is lower or higher than the specifications,

several causes may be considered.
* Low oil pressure is usually the result of clogged oil filter, oil
leakage from the oil passage way, damaged oil seal, a defec-
tive oil pump or a combination of these items.
* High oil pressure is usually caused by a engine oil which is
too heavy a weight, a clogged oil passage, improper installa-
tion of the oil filter or a combination of these items.

OIL FILTER
Refer to page 2-8 for installation procedures.

OIL SUMP FILTER

At the same time wash the oil sump filter cap. Check to be
sure that the strainer screen is free from any sign of rupture
and wash the strainer clean periodically.
Refer to page 3-46 for installation procedures.
6-19 FUEL AND LUBRICATION SYSTEM

LUBRICATION SYSTEM CHART

) EXHAUST ROCKER ARM SHAFT i_-

Epy’ ‘J:
INTAKE ROCKER ARM

Ii ’ 1 CAMSHAFT 1. JOURNAL ) 1

; 1 CAMSHAFT R. JOURNAL 1

f
;;;I$ CLUTCH 1_I ’
1. CRANK JOURNAL R. CRANK JOURNAL
1
f t

MAIN GALLERY

/ DRIVESHAFT /
GEAR AND BEARINGS

rOlL PANZ elf7

FUEL AND LUBRICATION SYSTEM 6-20