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millsc,jerseyboy,brandjur Guys, y'all are spending too much money for very little performance gain. I have a speedbump scraping, long as a Baptist sermon, custom GY6 150cc scooter that will out run most 250cc bikes and rides just as smooth and easy as you could want. Her name is Civil Disobedience and from starting out a year ago with a free 50cc Taotao that I got maybe 1000 miles out of, I've put maybe $650 total start to finish. That's everything including some tools and welding supplies. Not to say I haven't traded a little labor here and there for spare brake pads, variators, etc. You don't have to spend much at all really but you have to work for it. I've watched a guy throw hundreds if not thousands of dollars at his bike and still not understand why my pieced together P.O.S. ran and rode so much better. Here's what $650 and some bartering and begging got me in the way of parts. $100 went for a blown up Taotao 150cc with good 13"x3.5" tires, suspension, brakes and various sections of frame. I had swapped and traded for a 150cc engine that lightyears on it and had it mounted in that naked 50cc frame for most of the year. I bought a 30mm flatslide pwk powerjet carb, built an intake manifold and straight exhaust (no muffler), installed a $15 performance ignition system, 10 gram sliders, notched the pickup coil bolt holes and advanced the timing a few more degrees more, along with a few more tweaks and adustments. I rode it like that for the better part of the year. I was about $250 in on the build at this point. The engine was still running strong but getting weaker when I bought a brand new engine on Amazon with some of my stimulus money along with a few more parts. Around $400 worth of awesomeness. Before I even took it out of the box I pulled the head off and port and polished the runners, installed a A-9 cam, a homemade intake manifold, 9 gram Dr Pully sliders, and painted the engine covers. I rejetted the 30mm flatslide carb, 39 pilot and 125 main jets. All I can say is WOW!!! I'm just now out of the break-in period and I am blown away by how strong this engine is. It takes off like being shot out of a canon. If it wasn't 7ft long wheel to wheel it would pull the front tire off the ground. It does break the rear tire loose on anything but perfect pavement. Top speed is something around 70-75 mph right now but I have slightly taller final drive (15/38) on its way that should push it to over 80mph. Civil D is one sexy ride, long and low, with a voice like an opera diva. I've caught myself on numerous occasions just staring at her amazed that I actually built something so freakin cool, and for only $650. I have had people ask me how much I would sell her for. All I can say to them is that they wouldn't be willing to pay what I would want for her. I have no idea what I would sell her for, because I'd never sell my girl. Haven't even thought about it. Civil D and I are forever. Throwing money at a build doesn't do anything but waste money. If you want to go faster or just liven up your engine a little you're going to have to get your hands dirty. Porting and polishing the head and upgrading your cam is THE single best option for making more power out of a GY6. In my opinion if you don't port and polish the head FIRST it's really not going to breathe well enough to take advantage of any other upgrades. Since port and polish was basically the last thing I did it turned my scooter into a rocket ship. Save your time and money and do the head work first, you'll be glad you did.