Yamaha MA50 - Engine Component Specifications

Crankshaft:
Crankshaft
Assembly W idth (FJ
Crankshaft Deflection (A)
Connecting Rod Big End Side
Clearance (C)
Connecting Rod Small End Deflection IS)
Crank Bearing Type
Crank Bearing Type
Crank
Oil Seal Type
Crank
Oil Seal Type
Clutch:
Clutch
Type
s
(Left)
(Right)
(Left)
(Ri
ght)
Primary Reduction Ratio & Method
Clutch Shoe - Thickness
Clutch Shoe Spring - Free Length
Clutch Shoe Spring - Set Weight
Clutch-in Rev olution
Clutch-stall Revolution
Transmission:
Secondary Reduct
ion Ratio & Method
Transmission Gear Oil Quantity & Type
Reduction Ratio
& Method
Kick Starter:
Type
Intake:
Air cleaner type
Reed
Valve
Bendi ng Limit
Valve Lift
Tightening
Torque
Carburetor:
Type & Manufacturer
1.0. Mark
Main Jet
Air Jet
Jet Needle -c l ip Pos ition
Needle Jet
Cutaway
Pilot Jet
Air Screw (turns out)
Starter Jet
Fuel Level
Engi ne Idling Speed
(M.J.)
(A.J.)
(J.N.)
(N.J.)
(C.A.J
(P.J.)
(A.S .)
(G .S .J
(F.L.)
7-2
38 _g. OS mm (1.50 _g. 002 in)
0. 03 mm (0 . 0012 in)
0.35,..., 0. 55 mm (0 . 014 ,...., 0. 021 in)
0.4 ,...., 0 .8 mm (0.016,...., 0. 031 in)
6203 -C3
6203 - C3
5017 - 35 - 7
5023 - 35 - 7
Wet. Centrifugal automatic
63/33 ( 1. 909) . gear
1.0 mm (0.040 in)
34 .5 mm (1.36 in)
3.6 kg (7.
94 lb)
2.700 r/min
3.500 r /min
19 /15 (1.266). bevel wheel gear
Exchange:
300 cm
3
(0-26 IMP .qt)
Total:
350cm
3
(0 .31 IMP . qt)
Yamalube 4-cycle oil or SAE 1 OW/30 motor oil
57/10 (5 . 700). bevel wheel gear
Ratchet type
Oiled foam rubber
0.8 mm (0 . 031 in)
4.8
± 0.2 mm (0 .19 ± 0.008 in)
0.8 Nm (0 . 08 m-kg. 0.6 ft -lb)
VM12SC. MIKUNI
3L500 (3L501)
#75 (#70)
2.5
303-3 (3T3-2)
E-0
1.
0(4.0)
#45 (#40)
1-3 / 4 (1 -1/2)
#35
22 .0 mm ± 1 .0 mm (0 . 87 ± 0. 04 in)
1,700 r/min