When I drive the mini around, commonly in third or fourth gear and I tap the accelerator on/off quickly there is a noticable thud sound.
I thought the engine stabilisers were worn, so fitted new ones, and I even put in a third stabiliser altogether.

The noise still exists but isnt as loud. Do all minis do this or have I missed something else?

Is it a 1275?
It could be the harmonic balancer rubber worn if it is a 1275. That can also give you an audible knock on idle.

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Also if it is a Rover check the sub-frame mounts.
Cheers Pete

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A recent study found the average Aussie walks about 900 miles a year
Another study found Aussies drink, on average, 22 gallons of alcohol a year
That means, on average, Australians get about 41 miles per gallon

Kind of makes you proud to be an AUSSIE

Engine is an 1100 unit. Haven't checked the subframe mounts, will do tomorrow.