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383man
[Re: BSB67]
#713376
06/03/10 01:00 AM
06/03/10 01:00 AM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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I do agree I would try some wire in the MAB's to see if they are pulling enough fuel yet or if that rpm where it happens is to low and its still on the idle/transfer circuit. Once you are sure where (what circuit) it happens you can work it from there. You want no surge but you also dont want to foul plugs and use to much fuel. Now in the old days (60's and 70's) we would just fatten it some with more jet (had no adj MAB's) back then and if it fixed it well then cool. We drive it a few days and make sure it's not fouling the plugs. But now we have much more technology and should be able to tune for about 13 to 1 or so and eliminate the surge. I didnt pay attention to how new the carb is as I have seen worn throttle shaft's cause problems of this nature as it can get pulled and tilt then move enough in the throttle plate and let it pull air in when it should not. I also dont remember if you said you run vacum advance as it can cause a timing issue if not in sync with the mech advance. Anyway just throwing some more idea's your way but you sound like you know what to look for. Good luck and keep us posted on you progress. Ron
Last edited by 383man; 06/03/10 01:04 AM.
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