I've seen this type of thread a thousand times. I'm the first guy to tell you to go ahead and try it but I have to draw the line at bottom ends. As easy as this may seem, it's not. The manual gives you all of the info you need but unless you've done this a bunch of times and have the proper tools to do this, you have a 50 /50 chance of doing this correctly. Tusk tools are great but I don't use them. I built my own and they are specifically designed to do Blaster engines. Pounding seals in with sockets works but it's not the best way to do it. weiner a seal a few thousands of an inch and it's going to wear prematurely. When that happens, you have an air leak and the inevitable will happen. Pound crank bearings out with a hammer and a punch and the cases are going to distort. The correct way to do a bottom end is to check EVERYTHING. Most of this can be done by eye but the things that really matter can't. Start with the cases. Every engine I've ever built has had the center cases lapped on a 3” granite stone and every one of them needed it. DON'T COUT ON THE BOND TO SEAL THE CASES. I fire people for using rubber mallets and screwdrivers on cases. This is a big no no but this is what you will resort to to split these delicate assemblies. How do you check the new crankshaft you just bought? Do you have bench centers? Probably not. The first rule of a successful two stroke rebuild is to make sure you have an air tight engine. This requires a $400 granite stone, $150 worth of measuring equipment, an assortment of assembly tools and a vacuum gauge. I use a set of V blocks, IOS reregistered from the US Navy to check the run-out of shafts. I f you don't have these tools, you have a 50 / 50 chance of building an engine that will run. If you don't have these tools you have a zero chance of building and engine that will run at it's maximum potential. I build two stroke engines every day and I'll be the first one to tell you that it's not easy or simple. The little things matter. Case in point, how do you install a crank bearing? If you pound them in, you just made a terrible mistake. How do you set the crankshaft into the bearing on the clutch side? Special tools or processes. Why would you do this when any of the builders on this site will do a bottom end assembly for $150 or less and you'll never have a problem? If you're serious about the performance and longevity of your engine, let the pro's do it. DIY coming soon and you'll see what it involves. Sorry for venting...........had a very long day
