| 摘要 |
PCT No. PCT/EP88/01151 Sec. 371 Date Aug. 16, 1989 Sec. 102(e) Date Aug. 16, 1989 PCT Filed Dec. 14, 1988 PCT Pub. No. WO89/05910 PCT Pub. Date Jun. 29, 1989.An air-cooled single cross-flow cylinder head for motorcycle internal-combustion engines having a camshaft for valves controlling charge cycle ducts and with a scavenging direction SR aligned with the course of charge cycle ducts in the cross-flow cylinder head. The engine is provided with a relatively stiff valve drive with inlet and outlet valves and ducts arranged in planes which are essentially in parallel with respect to the scavenging direction and where the camshaft operates the valves by tappets arranged in driving connection with rocker arms in the cross-flow cylinder head.
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