Fuel explosion in carb

[matthew13]

Good evening, got a 2 ltr cu engine petrol van and problems with the right hand carb. With rocket cover off if I accelerate you can see an explosion of fuel into the carb and a popping sound. Any ideas what might be causing this?

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[SyncroMatt]

Usual suspects are valve timing or too lean a fuel mixture. Start with a bottoms up service. Check your ignition timing, valve clearances, mixture on that carb and you may have a blocked jet in that carb meaning a weak mixture.

[Rosie n' Jim]

As SyncroMatt says, but if the symptom appeared out of the blue it is likely to be a fuel blockage or cut off valve failure. 

[ajsimmo]

Could be as simple as the carbs needing balancing. Always the starting point for any running or performance issues.

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