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You might also consider that you could have back pressure in your exhaust system that increased as your engine got hotter.
Clean fuel + air + spark AND a clean exhaust system are all you need to keep an A4 humming, IMHO - I forgot to add cooling water.
Carb is also a good bet but consider the whole system, not just a single component. Cleaning the carb is not so difficult as others have posted.
Otherwise check in at moyermarine.com. Plenty of motor heads over there that know these old flat head engines like the back of their hands.
My best.
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"The cure for anything is salt water~ sweat, tears, or the sea." ~Isak Denesen
Last edited by CalebD; 08-27-2009 at 01:21 AM.
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