[ROVERNET - UK] hesitation blues

peter king peter at king-co.com
Mon Nov 27 12:33:59 GMT 2006


Thanks, Slats.

The floats measured up ok to the spec, but I'll try raising them a  
bit and see what I get.

Peter



On Nov 27, 2006, at 1:02 AM, Slatskars wrote:

> Peter,
>
> 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.
>
> Slats
> ----- 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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>
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