Sputters when throttling – Low power

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Hello all, my 2001 ATV is lacking power. I was hoping someone could help.
It sputters when I gas it, and it just doesn’t have any oompf anymore.
I took it to the garage for a single day, as I didn’t want to spend much on it. They didn’t find the problem, but here’s what they did :

Changed air-filter, sparkplug,oil and filter
Cleaned carburator
adjusted valves.

What can I try next to resolve this issue?
Thanks!

Sputters when throttling – Low power

.
.

Hello all, my 2001 ATV is lacking power. I was hoping someone could help.
It sputters when I gas it, and it just doesn’t have any oompf anymore.
I took it to the garage for a single day, as I didn’t want to spend much on it. They didn’t find the problem, but here’s what they did :

Changed air-filter, sparkplug,oil and filter
Cleaned carburator
adjusted valves.

What can I try next to resolve this issue?
Thanks!