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Hi Richard,
The fuel tap opens with vacuum so in "on" and "reserve" positions, the engine needs to be running for fuel to flow. The "prime" position gives free flow of fuel to the carbs without the engine running, which you would use if you have completely run dry or if you have had the carbs apart etc.
Check into the T3 forum for loads of info on your bike...
Cheers,
Roden
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