Re: Hey guys! Have a cruiser bike and hill climbing power would be nice..
OK walmart bike. Be certain you look at every weld and be certain no fractures. Next---Remove the fenders. If not properly prepared for the trauma of vibration they will break the tabs causing the fender to fall and get caught in the tires which will cause you great harm.
Anticipate problems and bugs which will stall you. Educate yourself fully. Watch Utube vids. and explore here on this forum the issues dealt with by hundreds of experienced builders and riders before you.
Now that is said.
The kits come standard with a 44 tooth sprocket. Because of your weight and the hilly route I would advise a 46t or possibly 48t, no more -probly rev too high. You will lose top end speed but gain mid grunt. Trust me you need not travel beyond 30mph- you want to be safe and conscience of the fact your on a bike not designed for a motor.