Yamaha BR250F - Specifications

7-1. SPECIFICATIONS
A. General
APPENDIX
Model BR250F
Model:
Model (I.B.M. No.) BR250F (8R4)
Frame
1.0. &starting number 8R4-000101
Engine
1.0. &staritng number R246-000101
Dimension:
Overall length 2,360 mm (92.9 in)
Overall
width (std) 870 mm (34.3 in)
Overall height (w/windshield) 940 mm (37.0 in)
Weight:
Net weight 130 kg (286.6 Ib)
B. Engine
Description:
Engine type
Engine model
Displacement
Bore
x Stroke
Effective compression ratio
Starting system
Ignition system
Lubrication system
Cylinder:
Material
Bore size
Taper
limit
Out of round limit
Combustion chamber volume
Compressionchamber type
Piston:
Piston skirt clearance (Measuringpoint)
Piston oversize
Piston pin outside diameter x length
Piston ring:
Piston ring design (Top)
Piston ring design (2nd)
Ring end gap (installed) (Top)
Ring end gap (installed) (2nd)
Small end bearing:
Type
Big end bearing:
Type
Fan cooled two-stroke 5-port
R246
246
ern" (15.01 cu. in)
70
x 64 mm (2.76 x 2.52 in)
6.1 :
1
Recoil hand starter
C.D.!.
II Autolube" oil injection
Castiron
sleeves aluminum
70 mm (2.76 in)
0.05 mm (0.0020 in)
0.01 mm (0.0004 in)
24.8 crrr' (1.51 cu. in) with spark plug
Dome
+Squish
0.045,...., 0.050 mm (0.0018'" 0.0020 in)
(10 mm
from piston skirt end)
1st 70.25 mm (2.766 in)
2nd 70.50 mm (2.776 in)
¢18 x 55 mm (¢0.709 x 2.165 in)
Keystone
Plain
0.20'" 0.40 mm (0.0078'" 0.016 in)
0.20'" 0.40 mm (0.0078'" 0.016 in)
Needlebearing
Needlebearing