I've just restarted my Cooper S after a diff change a few months ago, basically drained the tank, put fresh fuel in, new plugs & cranked it over, when it fired it reved up to 4 to 5-000 rpm, so i switched it off.

Checked the weber linkage, normal, checked over the manifold for air leaksm could'nt find anym no air leak at the booster vacuum port, basically got me stuffed.

The motor was removed, diff replaced, motor put back in, nothing major removed.

Any thoughts?

Doogie

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I won Hay once, here's the pic to prove it..


Hay, it's not about the car, it's not about the venue, it's about the people that come here. Peter Dwyer, Mayor of Hay NSW.

I couldnt imagine anything except a stuck throttle causing that.

Does the acc pedal feel normal?

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Dean Hutton's first car was a Mini.

Get yer foot off the go pedal

Throttle has normal travel & is it its normal postion.

Doogie

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I won Hay once, here's the pic to prove it..


Hay, it's not about the car, it's not about the venue, it's about the people that come here. Peter Dwyer, Mayor of Hay NSW.

Is there a brake booster attached? or any other vacuum lines?

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Dean Hutton's first car was a Mini.

probly sucking air from under the manifold from poor alignment after refitting just a guess

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

nitrous oxide leaking? oh wait, nah, that wouldn't make it rev...

is your hose to the brake booster cut where it goes through the inner guard?

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did I tell you that I won a trophy?

I've had the choke cable lock before so the car over revved when it started.
I thought the choke wasn't on, so took a minute to find.

For it to rev to 4000 the butterfly on the carb has to be open more than normal or it wouldn't have the fuel/air to do it. If the idle screw doesn't make any difference (I would guess that's the first thing you tried) you need to take the carbie off and check the operation of the butterflies.

Pete