[ROVERNET - UK] hesitation blues

Slatskars slatskars at comcast.net
Mon Nov 27 06:02:12 GMT 2006


You also want to check the carb float levels. The level in the float chamber 
is also the height of fuel in the jet. This is like a coarse adjustment. 
Adjusting the jet is the fine tuning.

----- Original Message ----- 
From: "peter king" <peter at king-co.com>
To: <rovernet at lyris.ccdata.com>
Sent: Sunday, November 26, 2006 7:38 PM
Subject: [ROVERNET - UK] hesitation blues

> Hi all.
> I installed the carburetors I rebuilt this weekend, and the good news  is 
> that I discovered that a problem I was having with stalling at a  full 
> stop was due to a missing roller at the accelerator damper. The  bad news 
> is that I'm still getting hesitation when I begin to  accelerate from a 
> stop. I also get some hesitation when I turn a  sharp corner at low speed. 
> I swapped my newly-purchased needles with  the thinner needles that were 
> in the old carbs, and noticed an  improvement overall, but not at the 
> beginning of acceleration. If I  choke, I get much improved acceleration 
> throughout the range. Without  choking, acceleration is steady through the 
> range, after the  hesitating start, but more sluggish. My U.S. spec carbs 
> were  installed with lock-tabs on the jet adjusters, allowing only for a 
> 3- flat leaner adjustment. If choking improves performance, then a  richer 
> mixture is needed, no? Should I be looking at removing the  tabs and 
> enriching the mixture? Could it be a weak fuel pump-related  problem? Or 
> something a different needle might cure? I read an  interesting article on 
> tuning SU carbs today that suggested a great  deal of improvement can be 
> had by proper needle selection.  ( here's  the link to the article: 
> http://www.team.net/www/morgan/tech/ tuning.html  )
> I've re-checked the timing, and have Pertronix ignition installed, so  for 
> now I'm ruling that out.
> Any thoughts on trouble shooting?
> Thanks,
> Peter
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