Yamaha RD250 Guide

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
t
t
Qr
|r)r
N
Or
tt
\-
+'
@
lnlet
port
@
E"harst
port
@
Scauenging
ports
-
(Transfer)
PORT TIMING
(MM}
,77
MODEL
,78
MODEL
A 29.5
<-
B 62.5 665

Yamaha RD250 Specifications

General

Displacement	247 cc
Cooling System	Air-Cooled
Ignition System	Contact Breaker Points
Front Suspension	Telescopic Fork
Front Brake	Single Disc
Rear Brake	Drum
Frame Type	Steel Tubular
Bore x Stroke	54.0 mm x 54.0 mm
Fuel System	Carburetor
Maximum Power	30 hp
Engine Type	2-Cylinder, 2-Stroke, Air-Cooled
Rear Suspension	Swingarm with Dual Shock Absorbers