Ducati 250 GT 1965, 250 Monza 1965, 250 Mach 1 1965, 250 Mark 3 1965, 250 Scrambler 1965 Instructions For Use And Maintenance Manual

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1 st. ISSUE - PRINTED DM - Mod. 751/E December 1964 - 10.000

Every Motorcycle receives one copy of the present booklet.

GUARANTEE CARD

Every D U CAT I MOT 0 R C Y C LEis supplied with

a (( Guarantee Card )) which will be found in the sealed

tool box.

The seal may be broken only by the purchaser.

4

(

The contents of this booklet are not binding and though the maIn specIfi-

cations of the motorcycle described and Illustrated in this booklet remain

unchanged. the DUCATI MECCANICA S,p,A, will be free to Introduce
modifications of some details. or of some accessories, If these modifi-

cations will be judged necessary, or if they can Improve the motorcycle,

or finally for some technical-economical exigencies. but without being

obliged to bring this booklet up-to-date.

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Dear Sir;

We are very glad to welcome you among our clients, and feel sure

that you will not fail to appreciate the magnificent performance

of the DUCATI Motorcycles.

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The magnificent performance and reliability of our machines reo

fleet the experience gained throughout many years of successful

racing both on track and road.

In order to obtain the fine service that the Ducati machine is

capable of giving, it is essential that the instructions contained

in ' this book be religiously adhered to.

If ,these instructions are followed closely, particularly during the

running-in period of the machine then you will be assured 0f-

many years trouble-free enjoyable riding.

We thank your for your patronage and congratulate you on your

wise choice of such a fine machine with its unequalled perfor-

mance.

DUCATI MECCANICA S.p.A.

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A FOREWORD

The main goal of the present instruction booklet is to enable the

owner of an over head earn-shaft DUCATI Motorcycle to use his

vehicle in the best possible way.

The lollöwìng notices are tñerêtore only simple recommendations,

suggestions, advices, and terms of reference, sufficient to enable

anyone, having no experience or ignoring any special technical

knowledge, to use his vechicle and to maintain it for a long time

in perfect working condition.

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'.

DUCATI SERVICING GARAGE

It is advisable when taking the machine to a garage for

repairs to ensure that the garage is a Ducati agent as the

staff will have been specially trained and the garage will
have been equipped with the necessary tools to carry out

any repair required. They will also carry a full stock of

genuine Ducati spares.

SPARE PARTS

It is absolutely necessary that each order for spare parts

clearly states the following data:

1) The catalogue code of the spare part (obtained from

the Spare Parts Catalogue of the model wanted).

2) Serial number of the engine (when ordering spare

parts of the engine).

3) Serial number of the frame (when ordering spare

parts of the frame).

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11

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IDENTIFICATION NUMBERS

Every DUCATI over head earn-shaft motorcycle can be

identified by its frame and engine serial number.

The same serial number is stamped on the central girder

near the battery.

The engine serial I1ürtbet is stamped on the crankcase

near the front connection between the engine and the

frame.

/!

(0

-- -. ---_.-------_._----- -'--- - ._-- --

12

.t

I - Engine serial number

2 - Frame serial number

._- ------_._-. - - _... -- . -- -----_.-

~.~.~ -"'.":.'::'_.. .., ,=..-=~::.,:_';~::;.. ;.'_; ':.' ':' :....:,__.

.'".. .,'-". ..... '...~..'''' .... '.' ~.~ ,,~-.._., '-~ .~- '~'~-' -., ..... '~-,'~'.'4"':;"-~-":"""':';-'..": ..... ..-_.........." ..,. _"'_'~":':''~ _' ~ .'.

.

The modern engine construction calls for very close tole-

rances between moving parts. It is essential that care is

exercised during the running-in period, a process which

has already been started by the factory. The engine

sliolJJd never he over-revved or allowed to(( slög )) dtifing

this time and recommended maximum speeds in gears

should be strictly observed.

. " . .. _. .. ~ -. '.'

"-,:,,-~....~~, .~~~--~-""...:;:..:i,,:',.:

PRECAUTIONS

to be followed during the initial running-in period

t.

DISTANCE TRAVELLED

--~------ '_.__.~- ~,-- . .. -------

Up to 300 mi les

Up to 500 Km,

"-", '-""'-""-" '" -'-", ,..,..

From

300

to

600

From

500 to 1000

miles

Km.

¡, ..;.. ,.w I ;. -z;¡ .... ;. .'dO... i ;, .., .,"'! ;, h, _

. ---- _.._---'--- -----

----..,,-, ---" '-'--,-.. - ,..-,--,----! '--'-'---i --, -----,-

MAXIMUM SPEED IN MILES AND KMS, PER HOUR

16 22 29 j 36 I 40

~ æ ~! æ M

21

34

31

50

40

64

I

i

49

79

i

56

90

I

13

-'-". -- -_. -_...

-. - .'~.. ......;......-.. ....ø.....wo;"'..:'. ..~..'

. . - -., -'.

It is advisable to change the oil first at 300 miles and

then at 600 miles (with the engine warm). Re-adjust

the tappets, regulating the adjusting screw in the 250 _

GT and MONZA, fitting the rocker appropriate shim

in the other 3 models; tighten cylinder head and holding

nuts, crankcase nuts and screws. Do not overtighten

as damage may result in thread stripping or bolts brea-

king. Readjust contact breaker.

In order to ensure careful running-in the carburetor has

been fitted with a distance piece which restricts the full

use of the accelerator. After

moved by your Ducati dealer.

Failure to comply with the above recommendations

absolves the manufacturer from all

and any damage that may result.

600 miles this should be re;.

liability of guarantee

14

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.

MAIN SPECIFICATIONS

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ENGINE

- Single cylinderl four strokel with cylinder inclined for-

ward 10° from the verticaL. The engine is supported

by a cradle formed frame.

- bore: 74 mm. (2.9134l')

- stroke: 57,8 mm. (2.27559")

- cylinder capacity: 248l589 C.c. (15.1698 cu.in.)

- compression ratio: 8 : 1 for the 250 GT and Mon-

zal 10 : 1 for 250 MACH 1 and Mark III, and

9.2 : 1 for 250 SCRAMBLER;

15

- . , ~ , ~. -.' ~. ''; -','-:' .J..,. ~ '.........;._:'..":.~~..~~~:.;.....~......:./..:.;~-i"!.i..":

- combustion chamber with hemispherical ceiling;

- cylinder barrel of light alloy, deeply finned and with

inserted special cast-iron liner;

- connecting rod of special steel with big-end assembled

on a cage roller' bearing and little-end bushed to take

the gudgeon pin;

- pistons of light alloy, convex topped and in one piece,

with four piston rings, two of which are slotted oils

scrapers;

- cylinder head cast in light alloy and closely finned

with inserted valve seats.

TIMING

The .¡timing system is provided with overhead valves, in-

clined at 80° timed by an overhead camshaft. The valves

are made of special steel.

250 GT and MONZA

SUCTION

COMPRESSION WORKINGSTROKE EXHAUST

~

PMI

BOC

BOC

16

PMI

PMI

BOC

PMI

BOC

~:Y:'~'-'';"'' , . -

.

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Specifications

The timing values, with a clearance of 0.20 mm. (0.0079")

between the valve and the rocker are the following:

Opening :t 5"

200 before TOC

500 before BOC

*

BDC

** TDC

Valve

Suction

Exhaust

i

Bottom dead center.

Top dead center.

250 MACH i and MARK III

SUCTION

COMPRESSION ,WORKINGSTROKE EXHAUST

I

I

Closing :t 50

700 after BOC .

300 after TOC ..

/:!~

\~~

PMI

BOC

BOC

BOC

BOC

Timing, with a clearance of 0.15 mm. (0.0059 in.) bet-

ween the valve and the suction rocker and 0.30 mm.

(0.0118 in.) between the valve and the exhaust rocker,

are as follows:

--_.._..~- ~--------' ---_.._-'---

Valve i Opening :! 5°

Suction 62° before TOC

Exhaust 700 before BOC

Closing :t 5°

76° after BOC .

48° after TOC ..

* BDC - Bottom dead center.

** TDC - Top dead center.

---,._~----- - -----.~_._----- _.,--------~

17

250 SCRABLER

'''/0. ..-.."...."'...;..;....:.:..:.;~~;;~..~.-

SUCTION

BOC

i

COMPRESSION WORKINGSTROKE EXHAUST

PMI

BOC

BOC

BOC

Timing with a clearance of 0.15 mm. (0.0059 in.) bet-

ween the valve and the suction rocker, and 0.20 (0.0079

in.) between the valve and the exhaust rocker are as

follows:

'~

-,

Valve

Suction

Exhaust

Opening

32°

before

55°

before

* BDC - Bottom dead center.

* ,.. TDC - Top dead center.

~'--'-'- -~------- ----

18

:f

5°

TOC

BOC

Closing

75°

44°

after

after

:f

BOC'

TOC"

50

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" - ."". -... .",-' ~"...-:.-..,-;,--,~.;...-~~.;...::~~::~

.

GT

MONZA

Clearance

The working clearance

between valves and ro-

ckers, when the engine

is cold, is of 0.05

(0.0020") to 0.07 mm.

(0.0028") for the 250

GT and Monza; 0.15

mm. (0.0059") respe

Li~ . vely 0.30 ,mm. (0.0118"2

t"' -Detween valve and suc-

-- tion and exhaust valve.

'for ~e 250 MACH -i

and ark III; respecti-

vely 0.15 mm. (0.0059")

and 0.20 mm. (0.0079")

for the SCRAMBLER.

The clearance has to be

adjusted and checked

with a feeler gauge, af-

ter the said timing data

have been controlled.

--~._---~_._------_._- .-__.- - ---._.- _.. ---_..- ._- ---------~._._--- ..- ..- ---_.._---- .".--'-- ---'----

Adjustment

The tappets are adju-

sted by means of the

adjustment screws

on the rockers in the

250 GT and Monza

and the appropriate

rockers shim on the

end of the valve

stem on the other

models.

MACH 1

MARK III

SCRAMBLER

19

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Engine timing

The timing gears in the crankshaft and on the camshaft,

are provided with reference marks engraved on the tooth:.

ed periphery.

The engine is timed when the above mentioned

marks are

disposed as indicated by the arrows in the following il-

lustration.

Timing

. - ,'-, +,~ ~ . ~ - ~

20

Timing

Ignition

.

AdJustment screw 01

the gear change

control fork

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Instance: Carburetor DellOrto UBF 24 BS . Spare parts in the 250 GT and MONZA

úJ

. .." ~."'.. -' _ r _~.."..;:".."":::;~.':--",:"'_..~:.".:,,~'~~:"!- . - ~ ~ ; -~ - - . ~. ~ ~. .

PETROL FEED

The petrol is fed to the carburetor by gravity.

The carburetor is DellOrto with quiet air intake on the

tool-box, for the 250 GT and Monza, with normal intake

in the other models.

.- -. ' ~ ,- , - "

Models

GT UBF 24 BS 260 B

MONZA UBF 24 BS

MACH 1

MARK III

SCRAMBLER I

I Carburetor

SSI 29 0 265

SSI 29 0 265

SSI 27 A

Atomizer

260 B

265

Choke

24 108
24

29
29

27

','

Main Jet

108

118
125

112

Idling jet

40

40

50

50

50

The petrol tank (for capacities and numbers of taps see

the list) is provided with a three position tap: closed - op-

en - reserve.

l

Models

GT

MONZA

MACH 1

MARK III

,

SCRAMBLER

Petrol tank

capacity It,

17

(imp.

gal. 3.7396

= USA gal.

4,4909 )

13

(Imp,

gal. 2.8597

= USA gal.

3.4342)

16

(imp, 2

gal 3,5196

= USA gal.

4.227)

16

(Imp,

gal. 3,5196

= USA gal.

4.227)

11

(imp.

gal. 2,4197

= USA gaL.

2.9059)

Taps number

2

2

2

2

Reserve It,

1,6 (Imp,

gal. 0,35196

= USA 0,4227)

1,6 (imp.

gal. 0.35196

= USA 0.4227)

1,6 (imp,

gaL. 0,35196

= USA 0,4227)

1,6 (Imp.

gal. 0,35196

= USA 0,4227)

I

1,6 (imp.

gaL. 0.35196

= USA 0.4227)

I

LUBRICATION

The engine is pressure lubricated, by means of a gear

pump driven by the shaft; this pump takes the oil thro-

ugh a filter, from the lowest point of the crank-case

which acts as an oil sump, and forces it through proper

oil-ways, to all parts of the engine which have to be lu-

bricated. The oil returns by gravity.

The sump capacity is of about 2 Kg. (4,409 Ib) = it. 2.400

(0.634 galL. USA = 0.5279 imp. gall.).

24