high pitched hum

[pmj423]

So I have noticed a High pitched hum from I believe the rear wheel. It starts at about 60 and gets louder the faster I go. However it only shows up when I am riding Solo. If I toss the 80lbs kid on the back it is not there. I had my tire changed this spring and just noticed it last week. but then I rarely ride at highway speeds when I am alone. I am wondering what I should check? is it possible something was not done correctly when they changed the tire.

I have also picked up a vibration this year that was not there last year. A friend told me this could be due to the front tire. The tread still looks ok but you can feel some small bumps when I run my hand over it.

[gscbertrand]

Improper air pressure can cause cupping as well as balance. I have heard that an imbalance of the fork oil will aid in cupping the tire.

[BradT]

Could be straight cut gears and this is likely coming from the right side of the engine, and only happens at certain speeds and gear.

 

If this is it is normal just need to hit the right speed and gear, and you can hear it.

 

Vibration maybe to low a gear and or a carb tune needed.

 

 

 

Brad