> A plea for help from a friend of mine ... Triumph Vitesse blew
> head gasket,
> head warped so skimmed, and put back together. Nothing else
> touched (timing
> or carbs etc). Very difficult to start up, eventually ran on 6
> cylinders but
> very rough. Was running well before gasket problem. Timing now checked and
> various settings tried - won't run at 4 degrees ATDC (manual figure), will
> run rough at about 12 degrees BTDC. Seems to be running weak (runs a bit
> better with choke half way out) but Stromberg carbs aren't adjustable (?)
> Friend at wits end - I said I would try the list for him - any ideas or
> suggestions?
Sounds like a vacuum leak to me. The 4 ATDC figure is only with the vacuum
retard active; 12 BTDC is about right if the retard isn't working or is
disconnected. I don't like the things, my suggestion is to permanently
disconnect it (plug the line), and always time to the 'static' value.
If you can't spot the vacuum leak otherwise (ie by squirting carb cleaner or
WD40 at all the suspect spots and listening for any change in engine rpm);
I'd probably pull the manifolds back off and look for where they weren't
seated properly. Note that an exhaust leak can also make the mixture weak;
although usually you can hear an exhaust leak pretty clearly.
Wouldn't hurt to run a compression check first tho, just to be sure it's
nothing more sinister.
Randall
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