You are right about having to lean and clean out the plugs. We had to do this 
back in the 60's, but we were useing 100 0ctane leaded. The Avgas now is 100LL 
(low lead).

robertbartunek <[EMAIL PROTECTED]> wrote:  With the use of 100LL I understand 
there is some concern about fouled 
plugs from the lead content.
Way back when I was flying round engines, we had a procedure on every 
shutdown to lean the engine to just prior to rpm "stumble" at about 
1700 RPM for three minutes to "cook" the plugs and burn off the lead 
deposits. Anybody heard of a legal procedure like this for 
Continental engines?





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