Sounds like the needles should be changed.
Mike
----- Original Message -----
From: "John Schmitt" <jschmi7@us.ibm.com>
To: <chaztg@hotmail.com>
Cc: <datsun-roadsters@autox.team.net>
Sent: Monday, February 12, 2001 11:19 AM
Subject: Re: SU needles
> Tony, I have had this problem since my rebuild which included new carbs.
> I always thought that it was only my car and I had a problem but I learned
> from this list that my situation is typical of 69-70 SUs without smog
pump.
> I did not mention, the problem seems to be at idle. Anything above that,
I
> am told there is no evidence of smoke. A couple of listers said they were
> experimenting with different needles and I was wondering if any solution
> had been found.
>
> Yes I have tried to lean out the carbs but too much and I get backfiring
> during deceleration and I know, at that leanness, I could burn my pistons.
> I have set the floats with no positive change.
>
> John Schmitt Telecommuter External # - 847-458-7829
> pager 800-759-8888 pin# 8710561
>
>
> "Tony Genovese" <chaztg@hotmail.com> on 02/12/2001 10:03:38 AM
>
> Please respond to chaztg@hotmail.com
>
> To: John Schmitt/Schaumburg/Contr/AT&T/IJV@IBMUS
> cc: datsun-roadsters@autox.team.net
> Subject: Re: SU needles
>
>
>
> Dear John and everybody,
> I have never owned a 2000w/ SUs, but I have owned a 1600 w/ SUs and I
still
> tinker with my 240Z and it has them.
> Taking off the emissions equipment shouldn't affect the running/starting
of
> the car quite like that. I would say possibly it's an internal engine
> problem--rings, valves,etc...
> However, the black smoke does indicate an over-rich mixture. Have you
tried
> leaning the carbs out at all, or checking your air filter to see if it
> needs
> replacing? It also could be the level of fuel in your float chambers, but
I
> think that's a stretch.
> Tony
> San Diego
> _________________________________________________________________
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