For the most part, the motor and exhaust sound real good.
BUT, when I put my head down by the running engine and give it a LITTLE throttle,
I can hear a noise. (just raise the idle basically)

Its hard to describe. It sounds like, some sort of friction. Almoast like something with the valve springs. I dont think the previous owner took very good care of the motor.
He blew up his CR125 by running straight gas through it. He didnt think that doing it ONE time would hurt it. WRONG!

Any suggestions? Compression feels good when cranking the motor with the kick.
I changed the oil yesterday and the oil is already dirty. Should I change it again?

Should I inspect the noise farther, or just ride the bike. If it breaks, it breaks.
Maybe its been making that noise for 10 years. who knows.

Any suggestions?

Thanks!

 

i dont know what it could be i say you just run it. good luck

 

cam chain?

its adjustable