I've been working on my new project motorized bicycle for the past couple of months. The bike I build must be light enough for me to carry upstairs. My current ride, Snow Tiger, weighs 70lbs; it's no problem getting it into the loft. I'm 70 years old, so my bikes have to be light enough for me to lift and carry a distance. My current ride Snow Tiger(ST) weighs 70lbs. My new project The Blue Twins weighs 61lbs. so far. It'll end up a few pounds heavier than ST. I'll post pics and share more. I was installing a Tanaka 47R, ala mid-frame and shift kit. Yesterday morning, the Tanaka was removed, making room for TWO pocket bike engines!! Mid-frame twins with shift kit!