Chain rubs against engine mounting stud nut


New Member
Jun 7, 2021
San Francisco Suburbs
Hello motorizedbicycling community! I have been using this forum for a few months now for help with my bike and so I figured I'd make an account and be apart of it. I will try and post a picture of it tomorrow since after all this work I'm pretty proud of it. Now on to my question:

My chain ever so slightly rubs the left engine mounting nut. It runs fine but it makes a bit of noise and seems bad for the chain. What can I do about this. I don't want to reposition the engine because I have it in a really good place and I don't want to mess it up. Could I grind down the side of the nut a little bit?