Yamaha EK25BMH Service Manual page 29

SPEC
Item
PISTON RING (2nd)
Type
(B)
(T)
End gap
(installed)
<Limit>
Side clearance
<Limit>
CRANKSHAFT
Crank width
Runout limit (D)
Side clearance (E)
Maximum axial play (F)
CONNECTING ROD
Small end diameter
CARBURETOR
Main jet
Main air jet
Main nozzle
Pilot jet
Pilot air jet
Pilot screw
Valve seat size
Float height
Float arm height
Idle speed
MAINTENANCE SPECIFICATIONS
Unit
Worldwide
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
(A) mm (in)
(B) mm (in)
(C) mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
(M.J.) #
φ mm (in)
(M.A.J.)
φ mm (in)
(M.N.)
(P .J.) #
(P .A.J.) mm (in)
(P .S.) turns out
(V.S.) mm (in)
mm (in)
mm (in)
r/min
0.20 - 0.35 (0.0079 - 0.0137)
0.35 (0.014)
0.03 - 0.07 (0.0012 - 0.0028)
0.07 (0.0028)
56.90 - 56.95 (2.2401 - 2.2421)
153.7 - 154.0 (6.0512 - 6.0630)
39.9 - 40.1 (1.5709 - 1.5787)
0.03 (0.0012)
0.2 - 0.7 (0.0079 - 0.0276)
23.904 - 23.917 (0.941 - 0.942)
Kerosene carburetor
155
1.3 (0.051)
2.8 (0.110)
50
0.92 (0.036)
1/2 + 2
1/2 - 1/2
1.4 (0.055)
18 (0.079)
—
2-4
Model
EK25BMH
Plain
2.0 (0.079)
3.0 (0.118)
2.0 (0.079)
Gasoline carburetor
—
—
—
48
0.90 (0.035)
1 - 1/2 ± 1/2
1.2 (0.047)
—
3 (0.118)
1,300 ± 50
E