I've been looking but haven't found a thread dedicated to the fine art of engine swaps. I've seen lots of posts in other threads but none dedicated to the art of getting the power you want into a chassis that deserves it. I'll start with two of my own. 1986 250 Ninja with a 600 Rotax single. ( I've sold it many years ago and I think the owner might actually be an Inmate, if so, let me know, I'd like to know how the bike is doing ) and here is my current daily rider, a 1989 CB1 with a '96 F3 engine. Both conversion roughly doubled stock horsepower and the fun factor. Let's see your swaps. Now that the bike is sold I'll transfer the pics from the add to here: ....and here is what it looks like today: Here are pics I took today that show the new mirrors ( CB1000R ) and the muffler mount as well as a bunch of detail shots. And here is a video clip of what the engine sounds like, cold engine start. Here is the nitty gritty: CB-1 frame modified to accept the F3 engine with the proper support. F3 carbs nestled between the frame rails and an F3 airbox that fits under the stock tank. Wireharness modified to use the TPS the F3 carbs come with, correct temperature sender installed to work with the new gauges. Full race stainless headpipes with a Ducati 1098 muffler 2007 CBR600RR forks with radial calipers and gauges from the same model. F3 wheels front and rear with proper sprocket alignment. CBR900RR rear shock with ST1300 spring. I will also include the stock CB-1 shock as well as the stock CBR900RR spring. The shock was rebuilt at the time the frame was stripped bare to be painted. Wet weight is 406 lbs, rear wheel horsepower is 94. Current mileage is just under 10,000 miles. The fuel tank and tail section were NOS and installed when I painted the frame, swingarm, wheels and engine around Christmas a couple of years ago.