high rev/ air leak

[onerian]

so ive had my motorized bike for about 5 months, and it used to run perfectly, but recently i replaced the brake lever from a standard, to a double lever on the same handle. i dont know how this would change anything, but after that it runs really weak and take a long time to rev down. i cant think of anything else that changed

 

[Deleted member 12676]

vibration causes things to loosen up like the screw tightening the carb onto the intake manifold

 

[onerian]

ok ill make be sure to tighten everything