Some carbs modified with the one piece venturi worked fine. I have no hard numbers, but I'd guess most of them were fine. There were a significant number that ran too lean, however, and there were a number of fixes. Some folks drilled the jet out to the next size. Precision was supplying different mixture tubes. The new AD allows retaining the old single piece venturi, but there is a frequent, recurring inspection required. My guess is that if you don't notice a problem, you havent got one. Try this. Go cruising at 75% power, engine warm. Put the mixture full rich. If it's too rich at low altitude on a day with dense air (like a cold winter day) you're ok. If you can't tell, pull the carb heat on slowly. This enrichens the mixture. If the engine slows down, it didn't need the extra fuel. If the engine speeds up, you were too lean at cruise. Get it corrected, one way or the other. Most people who had the problem reported rough running at cruise, with an improvement when carb heat was applied.
John > -----Original Message----- > From: Artie Langston [mailto:[EMAIL PROTECTED] > Sent: Monday, September 27, 1999 12:47 PM > To: John Cooper; [EMAIL PROTECTED] > Subject: Re: Plug fouling saga > > > John, I had the one piece venturi installed on my Marvel back > when the AD > first went out. I have not noticed any performance problems > with the carb > after several years. Does the leaning problem at cruise > effect all the one > piece venturis that were installed? What should you look for to tell? > > To be honest, I don't have money to throw away on some > specialty shop, just > to have them tell me the carb is working fine. A free air > tube would be the > least of the expense. I have my hands full keeping up with > required and > nessesary maintainence. I have had no problems with my plugs. > > Artie Langston > [EMAIL PROTECTED] > http://www.bassace.com > > > > >
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