HELP! Flapping sound during low rev

[wilz444]

hi ppl, i'm reali bothered by the flapping sound whenever i engage first gear or second gear n usually during low rev.. the foreman said it's the tensioner problem, and he cahnged it.. well, the sound doesnt come that often anymore but there still is at times.. what exactly is causing this disturbing sound? pliz help.. tq tq..


p/s : any recommended satria neo specialist workshop i can go to next time?

 

[Kagerosan]

fapping sound?