Hello all, my old 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!