It's been a long journey building a motorized bike from a Fixie/single speed flip-flop hub frame but for all intents and purposes I'm done. I gotta give thanks to the people on this forum; You people are awesome and helped me a lot! It started as a manged mess First Build: issues, but it got there. I can see why there are recommended bikes to use as a build... Things I had to do to make this "work" and look pretty... Sproket welded to a fixie gear and held on with a lock ring (hub spoke number wasn't compatible with pineapple rag joint and hub wasn't shaped to take the clamp type) Throttle cable kit to get rid of excess length All cables/wires run along frame in heat shrink tubing Magneto and CDI connections using bullet quickdisconnects (went through 2 each in the time it took to build) Soldered the spark plug boot connector to the wire core Back brake (NEED MORE BRAKING) Dual brake handle with ~60/40% distribution Better brake pads (NEED MORE BRAKING) Painted random parts flat black Short filter (had longer angled filter before) Intake offset to fit filter (smoother power over stock) Velocity stack for carb Headlight Rear brake light Rear fender (rooster tail is ridic in the rain at speeds) Wider BB for crankarm clearance past engine casing Crank sproket mounted on inside to keep proper chain line Bent muffler to follow downtube angle Bent chain guide so the pulley was parallel to the chain To Do's: Still can't tune carb to idle properly or have smooth power throughout throttle range. Better chain guide that sits in line with the chain Less consipicuous fuel tank CONSIDERATIONS: Down/seat tube angle is horrible for mounting. You will need to bend an aftermarket front mount to get it to sit right. Above issue causes chainline issues. You NEED a chain guide, because the chain on the lower side of the engine sproket will hit the casing Make sure your hub is compatible!!! Wider tires would be nicer... Things are kindof sketchy at top speed on 23mm. Keep tires properly inflated if running skinnies. Sidewall flex is no joke and can get you into some scary situations in turns. Just wanted to share some pics of my build. If you're running into issues trying to build up a single speed/fixie, feel free to shoot a message my way and hopefully I can help. All in all, super fun to build and even more to ride!