"Powell, Ken" wrote:

When I started racing 2-stroke motorcyles in 1971 I discovered that the leaded premium of the day
would quickly foul the  plugs in 2-strokes but the plugs in my 750 Honda (and my car) seemed
perfectly happy.  The solution of the time was to run 'Amoco white gas' (which of course had no
lead) in the 2-strokes.  Is it possible that poppet valves have something to do with this?  Maybe
something about the combusion chamber flow patterns with a 'port' type engine?

Ken Powell

Could it be that the lead compounds are being centrifuged towards the
spark plugs because of the rotating combustion chamber?

Paul Lamar
 
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