Hi Dave ,
In order to further validate that 90% of carburetor problems are electrical,
remove the Petronix. You wouldn't be the first to have problems with that unit.
Also check your rotor phasing. I had a similar problem a few years ago and in
my case it turned out my significantly retarded.
Mitch Seff
Oceanside, NY
75 TR6 SC
On Apr 24, 2011, at 3:07 PM, tr6@lbcs.ca wrote:
> Thanks for all the responses on my stumble. To your question Vance, it's
>definitely a stumble, almost like a small pop rather than a miss.
>
> On the theory that 90% of carburetion problems are electrical I've verified
>that all of the ignition components are sound. By the way I'm running
>Pertronix so points are taken out of the equation.
>
> I've set the timing by vacuum, and although it's showing about 20 BTDC it
>seems to run well so it could be wear in an older engine (timing chain or
>damper) that's giving an inaccurate reading.
>
> I've also gone to 30W in the dashpots from 10W/30.
>
> The stumble seems to have been reduced a bit so I'll drive it for a while and
>then reassess it to see what else needs to be done.
> --
> Cheers,
> Dave
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