Help，t120 Black Edition Shakes Really Bad

Hey everyone, I’m new here—glad to join the community! I picked up a T120 last year (2024) and man, it was such a joy to ride at first. But only after 600 km, it started acting up. When I twist the throttle quickly at low RPMs, the bike shakes really bad.

I made a video to show the difference: the first half is how it should run, smooth and normal. The second half? Total night and day—even at almost the same speed and RPM, the ride gets super rough, it’s really frustrating.

Worse yet, I took it to the dealer, they checked it out and said “nothing’s wrong with it.” I’m stuck here, so I figured I’d ask you guys: has anyone else had this issue? Or does anyone have tips on how to fix it? Would really appreciate any help!

 

Thx Joe

Thanks a ton, Joe! Really appreciate you walking me through this—super helpful. I’m gonna hit up the dealer this weekend and have ’em check things out like you suggested.

Quick add-ons to fill you in: This T120’s brand new, but I messed with the exhaust a couple times before the issue popped up. First, I just swapped the tail section for a Motone Jupiter cover. Then later, I went all in—yanked the cat, cut the whole exhaust, and threw on a shorty. But honestly? The low-end torque was garbage after that, so I switched everything back to stock. Oh, and I also chopped the rear fender to make it a bobber style too.

Do you think any of these mods could’ve messed something up and caused the current problem?

 

Hey Johnjo!
Super stoked to get your tips. I tried the method you mentioned—my dealer even helped reset the engine—but the shaking still hasn’t gotten better, unfortunately.