Re: Hello, new to building
I love that cargo rack.
Is the chain rubbing the seat stay?
If the chain is rubbing the seat stay, your only choice may be to widen the rear hub, which will spread the seat stays a bit. Do that by adding washers to each side of the hub, inside the dropouts to slightly spread the stays. Take it slow, adding only a pair of washers at a time. Don't spread the stays anymore than needed.
If the chain is rubbing the seat tube, there is an alignment issue somewhere with the motor mounts.
Look carefully at the pics of cruiser motorbikes, and you will see that most builders have trimmed the rear fender in the chain area.
“You're only young once, but you can be immature as long as you like" -Unknown