My gut instinct tells me it might be fuel, or fuel/air?

Check the simple stuff first: Is the petrol good? Is the fuel pump priming as normal when the ignition is switched on or does it sound weak or laboured? Is the intake/air filter blocked? Is the exhaust blocked or partially blocked?

Has the injector wiring rubbed through on the right hand frame rail frame? It may be shorting out, but only when the engine fires up and the vibrations cause the contact to earth?

I once has a very similar problem and it turned out I�d left a rag under the seat which had got sucked into the DNA filter (no snorkel)!

I�m assuming you checked you�ve got a spark? I guess you must have otherwise it wouldn�t start at all.

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