motor making weird noises.

[Dreamspeed]

my motor is making weird noises, it's a b16a. when i rev up to exactly 2900 rpm it makes this high pitched metallic vibrating sound the best description i can think of is when a person uses a power saw to cut wood and it makes that noise, the motor kinda sounds like that, and it only happens at 2900 rpm, no where else,

[BAM]

check ur timing belts....if u just did them or adjusted them, u might've tightened them abit too much. good luck , keep us posted.