Ducati 250 GT 1965 Specification sheet

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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. 4
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.
(\~
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.
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).
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.
I - Engine serial number
2 - Frame serial number
-- -. ---_.-------_._----- -'--- - ._-- -- ._- ------_._-. - - _... -- . -- -----_.-
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.PRECAUTIONS
to be followed during the initial running-in period
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.
t.
MAXIMUM SPEED IN MILES AND KMS, PER HOUR
DISTANCE TRAVELLED
¡, ..;.. ,.w I ;. -z;¡ .... ;. .'dO... i ;, .., .,"'! ;, h, _
--~------ '_.__.~- ~,-- . .. ------- . ---- _.._---'--- -----
Up to 300 mi les 16 22 29 j 36 I 40
Up to 500 Km, ~ æ ~! æ M
"-", '-""'-""-" '" -'-", ,..,.. ----..,,-, ---" '-'--,-.. - ,..-,--,----! '--'-'---i --, -----,-
From 600 miles i
300 to 21 31
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40 49
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56
From 500 to 1000 Km. 34 50 64 i79 90
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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 600 miles this should be re;.
moved by your Ducati dealer.
Failure to comply with the above recommendations
absolves the manufacturer from all liability of guarantee
and any damage that may result.
._~..- --_. --~_._- --- --... ...- -~ ....__.._~_._--
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.MAIN SPECIFICATIONS
',/~!(ir 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
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- 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
PMI
BOC
16
COMPRESSION WORKINGSTROKE EXHAUST
PMI
BOC
PMI
BOC
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PMI
BOC

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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:
Valve Opening :t 5" IClosing :t 50
Suction 200 before TOC 700 after BOC .
Exhaust i
500 before BOC I
300 after TOC ..
*BDC
** TDC Bottom dead center.
Top dead center.
SUCTION
250 MACH i and MARK III
BOC
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 0.30 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
SUCTION
BOC
i
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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 Opening :f 5° Closing :f 50
-, Suction 32° before TOC 75° after BOC'
Exhaust 55° before BOC 44° after TOC"
* BDC - Bottom dead center.
* ,.. TDC - Top dead center.
~'--'-'- -~------- ----
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