Dont man to bust your bubble in any way here but since I have that same bike I wanted to point out a couple things that are gonna cause you problems with your set up, hope you dont mind........
1.) I strongly suggest you get rid of that front fender unless you plan to add stronger mounting areas to it, if the very weak mounts give it up while your plugging along at a good clip you will likely experience a good solid face plant after you clear the handlebars. (wouldnt be pretty at all)
2.) I noticed in the pic that your rear sprocket is installed with the teeth offset toward the wheel and you still have the wide balloon tires on it..... this will likely cause the chain NOT to clear the tire I'm 99.99% on this one, and unless you turn the sprocket around you will have chain alignment issues.
3.) The rear fender will have to be notched to give the chain an area to pass by it without it hitting the fender, I finally just took my rear fender off of mine because the material is so brittle and weak that it started cracking and splitting in multiple places after a couple hundred miles, the fenders on these bikes just dont hold up to the abuse that having them motorized dishes out on them.
Below are a couple of pics of my Karaoke, it is dirty and has 600 miles on it now and most of that is on very rough dirt roads, I have a flat 36T sprocket I made up for mine on it and I put 26 x 1.95 tires on mine, you will likely be OK with the tire you have if you will turn that sprocket around and get rid of that rear fender and also the front on too IMHO, they aren't good enough for a motorized bike in my opinion....could be very dangerous for you if and when they break loose.
And yes the Huffy Karaoke is a nice looking bike IMO too even though there are some who think the huffy bikes are junk and not good to motorize I stand to differ with them based on my experience so far, I know they aren't built like a older American made bike, or the Bike shop $300-$500 bikes but mine has held up very good and is very comfortable after putting a nice Cloud 9 seat on it.
Good luck with your NEW really nivce build, just please review what I have posted here, it will save you some headaches guarranteed, maybe in more ways than one.!
The pics show 3 stages of the bike, made a couple other changes in between but I figure these 3 will do.
Best wishes, Peace
Here's a pic so far!
Couldn't use the coaster brake. the brake itself clips the bolts of the sprocket. I tried bending the brake a bit, no good, it would work if I took out the sprocket side rubber, and mount directly to the spokes. I don't want to do that. I just omitted the coaster brake, and I will install front and back caliper brakes.
starting to look amazing!