Hi everyone,
For the past couple of months I have been monitoring a grinding noise coming from my engine at specific RPM ranges. I hear it right before I shift from first to second, and second to third, and I presume that it is also present in the higher gears, though the wind drowns it out. I can also hear it when I decelerate through this same rev range, and it's even more prominent during deceleration. When I open the throttle more and increase the RPMs past this range, the grinding noise stops and the engine sounds fine. I can best describe the noise as a grinding or growling, akin to what you might hear if you had small metal parts vibrating on a metal table because of some machinery or something.
Over the past two months, since I started hearing the noise, I think it has gotten a little louder, and the range at which I can hear it has increased a bit. I am placing a video recording of the noise below:
https://www.youtube.com/watch?v=bhfK1riuJ_A&ab_channel=miamikid08sdadHere's what I've tried so far:
- I thought it might be the cam chain adjuster, but it does not sound like the Boulevard with a separated cam chain adjuster shown in this video: https://www.youtube.com/watch?v=cROjIvHH_Gs&ab_channel=MetricMotorcycleMadness
- I thought it might be a vibrating loose bolt on the engine somewhere, but I checked them and they are snug.
- I've heard that the speedometer assembly can vibrate in the tank and make a noise, but putting my hand on the speedo doesn't affect the noise.
I am hoping that some of you can:
- Help me identify where the noise is coming from,
- Indicate if the noise is a serious matter or just a thing that happens with this motorcycle,
- Offer a solution for how to fix the problem, if it's warranted.
Bike stats:
Year: 2013
Miles: 16k
Cam chain mod: don't think so
White space mod: don't think so
Oil: appropriate level and age
Riding style: nothing too crazy
Thank you for your time! Please let me know if I can provide any additional information to make your sleuthing easier!