YT125M with an issue

[mstan99999]

My fun lil death trap started caughing a while back. My mechanic buddy rebuilt the carb for me, replaced the fuel line and filter and brought it back to me. Now she SCREAMS through first and second, but bogs down and dies dead in third. Any ideas why? I'm stumped and would love some ideas.

Thanks :beer

[Yamada]

How is the air filter?

[Vealmonkey]

I would check your carb. Sounds like your idle\low speed jet is fine, but your main\high speed jet might be clogged. Also make sure the vent line for your fuel tank is not clogged.