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I'd vote for a vacuum line problem between the carb and petcock, but you seem to have that sorted (and if prime doesn't permanently make it go away it seems not).
If it definitely gets better for a while with prime or other fuel related antics, I would vote for that. Witch's hat filter in the fuel line? Guessing maybe vacuum building up in the tank (run with the cap partially open see if it gets better)?
I'd experiment with that before moving to replacing coils (expensive) or igniter (even more expensive). DAMHIK.
If it's always one dead cyl and always the same one (easy to find which one with a squirt bottle of water to find the cool header), you can start switching around plugs, plug wires, and coils through a process of elimination to see which one is dead and if it moves with parts swaps. Tracking down a Triumph T300 ignition tester would also help with this if it is convenient, there's one on ebay now.
Last edited by djw : 03-25-2008 at 01:59 PM.
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