>Less load on the engine I think. Anyone?

Higher horsepower-to-weight, lower horsepower-per-cc, entire engine
sitting in the air stream, no smog regulations, etc., etc., etc.

>>Funny, aircooled Japanese bikes had 4 valves per cylinder way back when!

>>>  Liquid cooling also allows for four-valve (or five valve)
>>>heads. The only way Porsche was able to get multi-valve heads with air
>>>cooling was to water cool the heads (the 959 and 962).
--
Dave Carpenter

Whatever you wish for me,
May you have twice as much.

"Sometimes I think we're alone in the universe, and sometimes I think
we're not. In either case the idea is quite staggering." -- Arthur C.
Clark