Jerking at low throttle
 

Hi! i just bought a 08 xtx. Before i tok my first ride i performed a service. (oil,filter,spark plug) The previous owner put on some leovince cans and some mod to the air box. He also changed the front sprocket down to 14 teeth. i dont know if they did enthing to the engine. The problem i have, is that the bike is really jerking on low-mid range throttle when cruising. Something that makes the bike terrible to ride... does anyone experienced simular problem?
The bike got 10000km on it.

Thank you!

Welcome!
Search for: O2 controller mod.

You can buy it from Kev.

thank you. Just ordered o2 and fuel map. also found that my bush drive is worn out..

Welcome to the forum! Steve

Thanks for the sale of the mods they are in the post to you, here is the link to the rear sprocket rubber mod: https://www.xt660.com/showpost.php?p=113529&postcount=1