Strange noise on exhaust side

[Zr900turbo]

Hi
Anyone heard this sound before?
Its only at idle, sled runs fine

 

[earthling]

I hear Morse code. .... . .-.. .--. / -.-- .- -- .- .... .- / -- --- - --- .-. / - .-. .- .--. .--. . -.. / .. -. / -.-. .- - / -.-. .... .- ... ... .. ... .-.-.-

I don’t think I have ever heard that before. Sounds like something vibrating in sympathy with the engine harmonics. Did you check for loose plastics or rub marks? Does it change with rpm?

 

[Zr900turbo]

I hear Morse code. .... . .-.. .--. / -.-- .- -- .- .... .- / -- --- - --- .-. / - .-. .- .--. .--. . -.. / .. -. / -.-. .- - / -.-. .... .- ... ... .. ... .-.-.-

I don’t think I have ever heard that before. Sounds like something vibrating in sympathy with the engine harmonics. Did you check for loose plastics or rub marks? Does it change with rpm?

Does not change, i think i found the source. Roll over valve is pulsing loudly, thats why i can hear it better from riding position