DUKE 390 TICKING NOISE
Hi everyone,
I recently rebuilt my bike's because it was burning oil. During the process, I did a valve clearance adjustment. I replaced the shims to bring both the intake and exhaust clearances strictly within factory specs.
However, during reassembly, some of the threads for the camshaft caps stripped. I had to get them retapped (helicoiled/threaded inserts) and used new bolts—some of which are non-OEM.
I double- and triple-checked my work: I rotated the engine manually 6 to 7 times and re-verified the valve clearances, and everything was perfectly within factory spec before closing it up.
But now, the engine is running quite loud (classic ticking/tapping noise). I've been riding it for about 2 days, and here is my theory:
I suspect that after running the bike for a bit, the new cam cap bolts might have backed out slightly or stretched, causing the cam caps to lift by a fraction of a millimeter. This would increase the valve clearance and cause the noise.
Has anyone experienced something similar? Do you think my theory holds weight, or could it be something else?
Any insights would be highly appreciated! Thanks in advance!