On Sunday, 24 May 2020 00:14:03 UTC+1, david wrote:
just bought a second hand belle 130 cement mixer. to find out it rotates so
quick it is dangerous and pretty useless. if i changed the capacitor would it
resolve the issue.
should i change the complete motor.
feel stupid and lost money .....any advise appreciated

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There's only one possibility. Someone has fitted the wrong motor.
It's an induction motor, the smaller ones commonly run at either 1480 rpm or 2800rpm. (ish, ie a bit less than synchronous).
They come in standard sizes/frames/shaft diameters

BTW make sure the gearbox has oil, they don't last two minutes without.
If there's a lot of play in the gearbox, (twiddle the drum) may not be worth repairing.