Hi guys,

After a recent trip to the mechanic, my XL125 is no longer accelerating as it should.

For a quick recap: the mechanic cleaned out the carburator (there had been a strange problem of the engine sputtering when it rained), checked a sound coming from the timing chain (turned out to be nothing) and adjusted it, and replaced the chain kit.

Since that visit, for whatever reason, the bike lacks power at low revs and takes quite a while to gain speed. This is especially noticable in 1st and 2nd gear, where there is a significant acceleration gap until above ~4000-5000 rpm. It's even worse when the engine is strained by going up a steep hill or with the extra weight of a second person, as the power is almost insufficient whereas before it could handle it easily. Also, if I throttle hard at low revs (even on neutral), the engine sounds bogged down and almost drops out before stabilizing.

Other than that, the bike starts instantly and idles fine. Outside of the power loss, there is no obvious issue. The carburator has been checked and double-checked by both the original mechanic and another with no obvious issue. The original mechanic also rechecked the timing chain and currently has no idea as to how they could have messed up the bike.

I'm certain that something the mechanic did is the cause of the problem, as I had done some fairly consistent riding in the weeks before without issue. Unforunately though, I'm running out of respectable mechanics to troubleshoot with as I'm located in Madagascar. Anyone have ideas on what could be the cause?

Appreciate any suggestions.

Kellen