Chapter 7. Appendix; Specifications - Yamaha BR250F Service Manual

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
Compression chamber type
Piston:
Piston skirt clearance (Measuring point)
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.!.
I I
Autolube" oil injection
Cast iron 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)
Needle bearing
Needle bearing