I've been a member that's sort of been hit and miss. More miss than hit, really. A few years ago, I got an X-19, and kept building it up and modifying it to try to keep up with a friend's crf150f that we raced in miniGP. It ended up with a 125cc Lifan motor. I modded the forks, came up with a complete custom brake setup with an oversized rotor, modified the frame, made my own shifter to use GP style shifting, fitted a Honda 954RR rear shock, used the tail fairing from an X1 or X2. It turned into something that handled way better than it really should have. The only problem with it was it's size, and the fact that I'm over 6' tall. I then got a crf150f and started modding it like crazy. During that time, I actually setup a fairly decent home machine shop in my garage. Well, it's time to take on yet another project.
MiniGP Bike, Version 3! I've decided I want something styled like a sport bike again, but sized so that I could feasibly ride it for 30 minutes at a time for the endurance races. I've considered building up a Honda Grom, but there is so much I don't like about those bikes, and so much wrong with the inherent design about getting the type of handling that I want. But, it's about the perfect size. So, I've decided to just build my own. To that end, I have a set of Honda Grom forks on their way. My plan is to potentially make my own triple trees (maybe even with adjustable offset). Make a headstock that will utilize Grom sized tapered roller steering bearings, and weld together my own aluminum perimeter frame and swingarm. I've already had a friend donate an R6 rear shock. I'm still in the process of studying chassis design. I've got a good handle on rake and trail. I need to get diameters of the PMT slicks I plan on using on stock grom wheels so I can start with realistic numbers. I'm now reading up about swingarm angle and anti-squat, moment arms for torque from acceleration and braking and balance between the two. I haven't completely decided on what engine I'm using, but so far I'm leaning towards using a Daytona 190cc engine and qualifying for the supermini class to compete with the new Ohvale bikes that are getting imported. (Speaking of which, if you haven't seen them, check them out at risemoto.com - I'm just not interested because they seem to be the same size as my x-19 and really expensive).
I realize that building my own bike from scratch and being grom sized might put this just outside the realm of pocketbikeplanet, but I also thought you guys might be interested. I also know that some of you really know your stuff and I've learned a lot from some of you. If you'd like, I'd be happy to start a build thread once I actually get started making parts. Or at the very least, start getting a real frame mocked up in Fusion 360 and have anything to share.
Edit: I just found my previous post from August about this, where I was less certain. Since then, I've had shoulder surgery, and I'm still in recovery/PT, which is why I have a lot of time for planning and mocking stuff up in Fusion 360 for now.
Pic of my pocket bike compared with a Grom: