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back in the late 1970 in Czechoslovakia an oldtimer show me how to check emission , he used a larger march and put it behind the muffler pipe .If the flame went in it was lean to ok ,if it went away from the pipe -it was to rich.For tuning we actually use short way VKV radio..sounds
Ivan
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1985 911 with original 502 191 miles...808 198 km
"The difference between genius and stupidity is that, genius has its limits". Albert Einstein.
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