[ROVERNET - UK] Mixture problems-resolved, sort of...

Larry lewill at ctcweb.net
Sat Oct 20 13:41:01 BST 2007

Steven, I too am having a tough time with tuning my TC. I have a Petronix 
unit in  place and I would be interested in what they say when you call 
them. Regards, Larry
----- Original Message ----- 
From: "Steven Dibdin" <sdibdin at hotmail.com>
To: <rovernet at lyris.ccdata.com>
Sent: Thursday, October 18, 2007 3:23 PM
Subject: [ROVERNET - UK] Mixture problems-resolved, sort of...

Hi All,

Thank you for all your responses. I have tried a number of solutions and the 
results are:

New flame thrower coil with points give the best idle and performance. This 
must be the first case of Lucas products beating modern electronics. I will 
call petronix to discuss later on. When left to idle plugs would soot up 
from incomplete combustion after about 90 secs.

The spark at idle with the petronix unit in place was yellow and quite weak 
(0.030" gap on plugs as per instructions).

With the points in place it was much stronger and would jump a much bigger 
gap. Engine idled for 5 minutes with out a change in idle speed or 

I Checked plugs after and they were a nice biscuit colour suggesting correct 
mixture and full combustion. This is with the mixture set as per the manual. 
Lift pins 1 mm engine note rises then drops on each carb.

So it would seem the mixture was a red herring, it was down to a weak spark 
at idle causing poor ignition and rough running. Strange that at higher RPMs 
the problem ceased. I still wonder if it was down to voltage difference at 
idle affecting the hall sensor.


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