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Difficulty starting

It's been running great for months on end, today it won't start, except after prolonged cranking, 30 - 40 seconds then it will splutter into life.

Sparking is fine. Plenty of fuel through return line.

When it does fire up it's lumpy on tick-over but seems to run o.k. normal driving. Plug was dry and a nice coffee colour when removed to check spark.

Any suggestions, please.

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    CAS (Crank angle sensor) may need adjusting! Looks like a mechanical boob on the left side of the Cam cover

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