Thank you for the support, it’s nice to know I'm not the only one that's tried this ha-ha! I was planning on a slanted head from the beginning for the increased compression, but with further investigation it does seem to be an inevitability. I do thank you though for recommending the use of a slanted head.
The intake also seems to be a really big problem with clearance issues, I agree with you on a different position. I’d like to get an intake that allows the carburetor to face forwards. One that has minimal bends, is the right diameter, and won’t restrict fuel and air flow.
My next issue is working on a way to connect the motor to the rear hub without using the included hardware. I have found several solutions I’m just not sure which would be the best; The HD axle kit, or the clamshell design. The both have pros and cons, being mostly the price. I like the axle because it can be purchased with a HD rim already laced up, or by it’s self. The clamshell is cheaper and is easier to install, just put it on your existing hub and go. Neither puts stress on half the spokes, in turn they spread the stress over all the spokes.
I have decided to go with the Grubee 66/80 cc Engine kit for my build. One of the main reasons is the availability of performance parts, and accessories made for these engines. I also like that they are highly reviewed and recommended.
I’m also working on developing a fully functional low weight, and reasonably priced 12 volt DC electrical system. I like a 12 volt system over a 6 volt system because parts are cheaper, widely available, and practical. I think that if this is my daily ride, I’d like to charge my cell phone/laptop, and still be to power my lighting and other electronics. It will be a while before I get into working on it, but I am going to keep it updated.
So in about 2 weeks I will be ordering my kit and other parts to get started so bear with me on my progress! I love to do a lot of research before I buy something, minus the bike. I got it because it was over half off ha-ha. I really thank the help from everyone and I enjoy this hobby already!