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Got an inline fuel filter? If so it could be clogged, or could be a car filter that restricts flow.
Otherwise, my first suspect would be gunge in the fuel system through the petcocks to carb jets. Common on old bikes that have sat long.

And it is always worth trying a new set of sparkplugs in an old bike out of storage.
And the plug leads on those old Triumphs go bad with age, they were carbon leads, best replaced with wire core leads.
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