Tab -
The tach only tells you about the low tension side of the ignition. The
problem could well be between the coil and the plugs (high tension side).
Check for a bad cap or rotor, or cross-firing between the plug leads.
Also check for tracking on the spark plug ceramic.
Been there, diagnosed that.
Chris K.
>Date: Fri, 19 Sep 2003 12:30:59 -0400
>From: Tab Julius <tab@penworks.com>
>Subject: Re: How to best clean twin SU carbs?
>
>This is sort of my first endeavor into the fuel end of things - usually
>I've fought with other issues, so I apologize for maybe overlooking the
>obvious.
>
> From previous postings we've eliminated (roughly) the ignition flaking
>because the tach stays in sync with the engine, and my understanding was
>that if it was electrical then that thing would be bouncing all over the
>place. It also just "feels" like it's related to fuel delivery, although I
>know that's not a very objective diagnosis.
>
>I will check the other bowl, but as far as just checking the carb itself,
>the top part is the place to be looking, yes? I don't want to go into the
>guts of it and mess up the tuning if I don't have to.
>
>Thanks
>
>- - Tab
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