Gears slipping

[Alan Fawcett]

I recently changed the cassette on my MTB and ever since doing so the gears seem to be slipping when I put the power down how do any of you suggest adjusting it it changes perfectly and peddles fine until I really try to lay it down on the trials thanks in advance Alan 👍

[Painkiller]

quite often one may need to put a new chain on along with the rear cluster

[Alan Fawcett]

It has got a new chain and chainring and cassette

[Painkiller]

how about some extra info, how long have you had the bike? Did you buy it new or used? did you or someone else actually do the job of the said replaced parts? In other words are you your own mechanic?

[Jesper]

Were there any problems prior to changing the cassette and why was the cassette changed (worn out, new gearing, etc)? Have you overhauled the derailleur?