[ROVERNET - UK] hesitation blues
peter at king-co.com
Mon Nov 27 12:33:59 GMT 2006
The floats measured up ok to the spec, but I'll try raising them a
bit and see what I get.
On Nov 27, 2006, at 1:02 AM, Slatskars wrote:
> 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?
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