strange noise, 02 cr125

[125jens]

i havent had this bike for too long. just bought her. its totally stock expcept for a pro circuit pipe and silencer and it has a brand new top end in with about 10 hours on it now. when the bike is idling it makes a racheting chatter coming from the engine. when i ride the bike the chattering goes away in the mid-high rpms and only seems to happen in the low rpms. when i rev the bike up a bit the noise doesn't seem to get faster or louder at all. any input or help would be greatly appreciated.


p.s. not sure if this matters any but the bike is running 40:1 with belray hr1 but will be switching to dominator after this tank of gas.

[erik6767]

is an exhaust spring vibrating against the head pipe? sometimes that will make a real weird noise

[YZ125MXer]

Check all ur fasteners but the exhaust spring was a good idea

[125jens]

ive checked the bike over for loose anything. im almost certain its inside the engine. what i find weird is the noise doesn't get faster or louder with the rpm but once the bike is running in the mid to top rpm it doesnt make it at all.