So I just bought a 2012 DR-Z400S and love it. Bike has 1700miles on it now and around 50hours. P.O. was an older gentleman who took fantastic care of the bike as far as maintenance goes.
The bike has developed a ticking noise at idle/high idle. The noise is louder once the motor has warmed up, most likely due to the change of viscosity in the oil.
I got my stethoscope and can't totally isolate the location of the noise, but with the stethoscope probe on one of the motor mount bolts, it's more prominent.
I'm beginning to lean towards the noise being ACCT-related, although I've heard the newer models are more stout.
Any further diagnostic steps you guys could recommend?