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●Yamaha SZ-R Specifications & Features ◆Engine Engine type Air-cooled, 4-stroke, SOHC ◆Displacement 153 cc ◆Bore & Stroke 58.0 × 57.9 mm ◆Compression ratio 9.5:1 ◆Maximum power 12.1PS / 7,500 rpm ◆Maximum torque 12.8N.m / 4500 rpm ◆Starting system Electric Start ◆Lubrication wet sump ◆Cylinder layout Single cylinder ◆Clutch type: wet, multiple disc ◆Ignition system C.D.I ◆Fuel supply Carburettor ◆Battery 12 V, 5 AH (10 AH) ◆Headlight Halogen bulb (12 V, 35/35 W) ◆Primary/Secondary reduction ratios 3.409/3.000 ◆Transmission type 5 gear constant mesh Caster/Trail 26 degree/99 mm ◆Gear ratios 1st=2.714, 2nd＝1.789, 3rd=1.