Yamaha MA50 - Engine Specifications

7-1. GENERAL SPECIFICATIONS
A. General
Model :
Model (l.B.M. No.)
Frame
l.D . & Starting Number
Engi ne 1.0. & Starting Number
Dimension:
Overall Length
Overall Width {standard)
Overall Height {standard)
Seat
Height
Wheelbase
Minimum Ground Clearance
Weight :
Net Weight
Performance:
Minimum Turning Radius
B. En gine
Description:
Engine Type
Engine
Model
Displacement
Bore x Stroke
Compression Ratio
Starting System
Ignition System
Lubricati
on System
Cyli
nder head:
Volume {w it h spark plug)
Cyli nder :
Material
Bore Si ze
Taper Limit
Out of Round Limit
Piston:
Piston
Clearance
Piston Over Size
Piston
Ri ng :
Pis
ton Ri ng Design
{Top)
Piston R ing Design {2nd)
Ring End Gap
(Installed) {Top)
Ring End Gap
(Installed) {2nd)
Ring Groove Side
Clearance
(Top)
Ring Groove
Side Clearance {2nd)
Small End Bearing:
Type
Big
End Bearing:
Type
): Except for Australia and
New Zealand
3L8 (4FO)
3L5-700101
3L5 - 700101
1 .550 mm (61 .0 in )
670 mm (26 .4 in) (600 mm . 23 .6 in)
965 mm (38 .0 in)
705 mm ( 27 .8 in) (695 mm. 27 .4 in)
1
.050 mm (41 .3 in)
120 mm (
4. 7
in) (110 mm . 4.3 inl
43 kg (95 lb) (42 kg. 92 lb)
1.500 mm (59 .1 in)
Air cooled 2-stroke. Gasoline. Reed valve
3L5
49 cm
3
(3.0 cu .in)
40 .0 mm x 39 .2 mm (1. 575 in x 1. 543 in)
6.0 : 1
Kick
C.D.I.
Separate lubrication (Yamaha Autolube)
7
.0 cm
3
I0.43 cu. in)
Special cast iron
40 mm (1. 57 in)
0. 05 mm (0.002 in)
,
0. 01 mm (0 . 0004 in)
0. 035 ,..,_, 0. 04 7 mm (0 . 0014 ~ 0. 001 9 in)
40 . 25 mm. 40 .5Q mm { 1 . 5B5 in . 1. 594 in)
~\
Keystone ring
Keystone ring
0. 15 - 0. 35 mm (0.006 ,..:, 0. 014 . in)
0. 15 - 0.35 mm (0 . 006 - 0. 014 ir;i)
0. 03 - 0. 05 mm (0. 001 - 0. 002 in)·
0.
03 - 0.05 mm (0.001 - 0. 002 in)
Needle bearing
Needle bearing
7-1