Thanks, everybody. I will go with the 4-up. T-Bolt's Piranha 140 looks like the ticket. They sell a CDI upgrade that might make starting a little easier for my gf. She's no wimp but she will be a total novice. Maybe I'll also get a larger kickstart lever. Any thoughts on carb size? It looks like a 22mm comes with the motor. I'd like to use the stock CT90 airbox and muffler (or hack together an exhaust that looks similar to stock).