Yamaha RD250 Manuel utilisateur

MODEL GUIDE

PREStrNTATION Dtr MODtrLtr

MODELLANLEITUNG

90894- 09025

NOTE: INFORMATION AND OTHER TECHNICAL DATA (tNCLUDtNG SpECtFtCAT|ONS) tN THtS

MODEL GUIDE MAY BE SUBJECT TO CHANGE WITHOUT PRIOR NOTICE.

A. FEATURES

@urcur pERFoBMANcE ENGTNE wtrH

_ NEW CYLINDER

- NEW EXHAUST MUFFLER

- c.D.t.

_ BIGGER CARBURETOR

@sorr roucH opERATtoN oF cHANGE eEDAL

@cnsrrruc wHEEL wtrH BLAcK coATtNG

@serren RTDTNG posrrroN wtrH NEW HANDLEBARS

AND FOOT RESTS

I.D. & ENGINE/FRAME NUMBER

MODEL NAME l.D. Nos, E/G STARTING Nos. AREAS

RD250 2R8 1A2-220101 A, B, DK, NL, CH, UK

RD25O 2TO 1A2-310101 D

RD25O 2T'l 2T1-000101 F

R D4OO 2R9 143-110101 A, B, DK, UK, SF, D, NL, S, CH

RD4OO 2T2 2T2-OOO101 F

f,_

B. DIFFERENCES FROM 1977 MODEL

MODIFICATION

IENGINE SECTION]

1. Kick starter has been changed from the ratchet

REMARKS

Better function

Easy operation

type to the Bendix type.

Primary driven geer width has been reduced.

A dimension: 15 mrn-12 mm

Carbu retor

a. Synchronizationport

-2-

MODIFICATION

b. Carburetor setting

RD25O ,77 MODEL ,78 MODEL

MODEL VM28SS <-

I,D. No. 1 5200 2 R800

MJ # 115 <_

AJ 1.0 0.8

JN 5L3-2 5L1-4

NJ o-8 o-6

CA 2.5 2.O

AS 1% <_

GS #70 <-

NOTE: The above specification may be changed without

prior notice.

RD4OO '77 MODEL ,78 MODEL

MODEL VM28SS <-

l.D. No. 14300 2R900

IVIJ # 120 # 145

AJ 0.5 <-

JN 5L1-3 5J6-3

NJ P-2 o-8

CA 2.5 <-

PJ 25 <-

AS 1% <_

GS #70 <_

NOTE : The above specifications may be changed without

prior notice.

For better engine performance the shape of

transfer port and inlet port timing have been

changed.

RD25O

REMARKS

Easy engine setting

|r)r

\- +'

@ lnlet port

@ E"harst port

@ Scauenging ports

- (Transfer)

PORT TIMING (MM}

,77 MODEL ,78 MODEL

A 29.5 <-

B62.5 665

MODIFICATION

C tntet port

@ Exhaust port

@ Scauenging ports

(Transfer)

REMARKS

Due to change of inlet

port timing

Better engine

perf ormance

5. MANIFOLD (For RD400 ON LY)

For better engine performance, both right and

left manifolds are provided with balance pipe. t

7have been

PORT TIMING (MM)

77 MODEL ,78 MODEL

A33.5 <_

B395 41 5

c640 68.5

trN

ocn

ffiffi.)

PISTON (For RD400 ONLY)

Change in shape

EXHAUST PIPE & MUFFLER

Both inside diameter and volume

changed.

MODIFICATION

IELECTRTCAL SECT|ONI

1. Modification of lgnition system

Battery lgnitio

2. lgnition coil 2 coils- 1 coil

3, Voltage regulator and rectifire

Separate type ..------ lntegrated type

C.D.l. lgnition timing adjustment procedures.

C.D.l. lgnition

1. lnstall dialgauge to left side spark plug

hole.

2. Rotate crankshaft countrclockwise up

to T.D.C. and slowly turn it clockwise

until dialgauge indicates the specified

spark advance position.

R D250 BTDC 2.00 l- 0.1 5 mm

R D400 BTDC 2.30 1 0.1 5 mm

3. At this time, adjust magneto base

using screw driver until both marks

(lF, l) become alignment.

REMARKS

Better engine

performance

Not interchangeable

Due to use of CDI

Prevention of plug

from coming off

4. Spark plug cap with rubber ring.

Screw driver

lry Rubber ring

MODIFICATION REMARKS

IFRAME SECTION]

1. Caliper Ass'y (Front & Rear)

Change of operation method

Fixed caliper type-----> Floating caliper type

(Tow pistons)

2. Front fork Ass'y

Fork Travel

lnner tube

diameter

(One piston)

120 mm------->140 mm

344 ------------> 354 t

3. Better riding comfort due to change in riding

position by changing the mounting position of

handlebars and footrests.

POSITION ,77 MODEL ,78 MODEL

@570 mm 576 mm

G) 202 196

@500 500

o199 224

o00 e:30'

C. GENERAL SPECIFICATION

D. SERVICE DATA

\',

RD25O RD4OO

DCH, DK. F

UK, NL, ABD, CH, SSF, DK, F

UK, NL, A, IB

DIMENSIONS/WEIGHT

Overall length

Overall width

Overall height

Wheelbase

Minimum ground clearance

Machine net weight

2,030 mm

760 mm

1,060 mm

1,320 mm

150 mm

172 kg

2,015 mm

(CH. DK)

1,995 mm

(UK, NL)

145 mm (CH,

DK, UK, N L, D,

F)150 mm (A)

170 kg (CH, DK)

172 kg lF , UK,

NL, A}

1,955 mm

(F, A, B}

1,325 mm

'I 5O mm

170 ks

2,030 mm

<-_

760 mm

1,060 mm

1,320 mm

'l 5O mm

174 kg

2,Ol 5 mm

(DK)

1,995 mm (F,

NL, UK, I, A}

172

174 ks (DK)

1,995 mm

1,325 mm

174 ks

ENGINE

Type

Bore/Stroke

Displacement

Compression ratio

Starting svstem

Lubricating system

2 cycle aircooled

54x54

247 cc

N,A

Kick starter

Automatic

separate

6,2 <_

<--

64x62

398 cc

6,2

<-_

CLUTCH

Type

Primary drive system

Primary drive ratio

Wet multiple

disk

Gear

6A121

Gear

66123

TRANSMISSION

Type

Reduction ratio 1st

2nd

3rd

4th

5th

6th

Constant mesh

36114

32118

29122

26124

25126

24127

<-_

<--

<-_

SECONDARY DRIVE

Type

Reduction ratio Chain

38117 <_

<_. <-

36117 <-

35/17 <-

<- <_

361't7

ELECTRICAL

lgnition type c.D.t. <- <- <- <- <-

CARBURETION

Type

Effective venturi size

Main jet

Needle jet

Jet needle

Air screw (Turns out)

Cut away

VM285S

#tts

o-64

5L14

't%

2.O

<--

vM28SS

#tqs

o-8

5J6-3

2.5

VOLUMES/TYPE FLUID

Gasoline tank

Transm ission 16.5 e

1.5 e <-

<_ <-

<_ 16.5 e

1.5 e <_

<_ <_

-7-

MEMO

Oul

-8

YAIYIAHA MOTOR (C(O., LTD, Y

PRINTED IN JAPAN

??to 28x1c

(4.1/^)

IWATA,.IAPAN

Autres manuels pour RD250

Ce manuel convient aux modèles suivants

Table des matières

Autres manuels Yamaha Moto

Yamaha

Yamaha AG100FA Manuel utilisateur

Yamaha

Yamaha VMAX VMX12W1 Manuel utilisateur

Yamaha

Yamaha MTN1000 2016 Manuel utilisateur

Yamaha

Yamaha PW50(S) Manuel utilisateur

Yamaha

Yamaha QT50 Manuel utilisateur

Yamaha

Yamaha 125 AS3 Manuel utilisateur

Yamaha

Yamaha TT-R50E Manuel utilisateur

Yamaha

Yamaha YZ Series Mode d'emploi

Yamaha

Yamaha FJ-09 2014 Manuel utilisateur

Yamaha

Yamaha YZ450F(Y) Manuel utilisateur

Yamaha

Yamaha X MAX CZD300P 2022 Manuel utilisateur

Yamaha

Yamaha TT250RM 1999 Manuel utilisateur

Yamaha

Yamaha XT 600 AC Manuel utilisateur

Yamaha

Yamaha Thundercat YZF600R Manuel utilisateur

Yamaha

Yamaha 2008 WR250X Manuel utilisateur

Yamaha

Yamaha MT-10 2020 Manuel utilisateur

Yamaha

Yamaha DT125RE 2005 Manuel utilisateur

Yamaha

Yamaha TT-R110 2023 Manuel utilisateur

Yamaha

Yamaha 2014 YZ85 Manuel utilisateur

Yamaha

Yamaha Fazer 8 2014 Manuel utilisateur

Yamaha

Yamaha XT250 Manuel utilisateur

Yamaha

Yamaha AL125 Manuel utilisateur

Yamaha

Yamaha FZ6RC Manuel utilisateur

Yamaha

Yamaha DRAG STAR XVS125 Manuel utilisateur

Manuels Moto populaires d'autres marques

OHVALE

OHVALE GP-0 Manuel de la liste des pièces

KTM

KTM 350 XCF-W USA Manuel utilisateur

HYOSUNG

HYOSUNG ST7 Manuel utilisateur

Husqvarna

Husqvarna FC 250 2016 Manuel utilisateur

Ducati

Ducati SCRAMBLER 800 Manuel d'instructions

MOTO GUZZI

MOTO GUZZI QUOTA 1100 ES Manuel utilisateur

APRILIA

APRILIA ETV MILLE CAPONORD - PART1 02-2001 Manuel utilisateur

KTM

KTM Freeride E-XC 2021 Manuel utilisateur

Fantic

Fantic Enduro 125 Manuel utilisateur

Ducati

Ducati Supersport 750 desmodue Manuel utilisateur

MV Agusta

MV Agusta 2008 F4 312RR 1078 Manuel d'instructions

Ducati

Ducati 748 monoposto strada Manuel utilisateur

ATK

ATK 1988 250 Manuel utilisateur

Excelsior-HENDERSON

Excelsior-HENDERSON 1999 HCX Manuel utilisateur

Triumph

Triumph Thunderbird Manuel utilisateur

Ducati

Ducati 996 Manuel utilisateur

BMW

BMW MOTORRAD K 1200 R Sport Manuel d'installation et d'entretien

BMW Motorrad

BMW Motorrad G 650 GS 2007 Manuel d'installation et d'entretien