In my spare time I tried my hand at making a Frankenbike. My friend bought this project for $350. because he thought it looked interesting & asked me to get it running/functioning. When I got it I found out it had a 1991 Kawasaki KDX200 frame with a 1972-73 Honda SL250 engine & a 1981-84 Yamaha tank. The first thing I did was re-built the frame- the project starter just cut the frame in two & welded it back together. The rear wheel and front wheel didn't align, the motor couldn't come out!, the engine height didn't work with the rear sprocket side to side or up and down with the swingarm. So I butchered it up and aligned everything to function properly. I then went to getting the motor to run- I found a crack in the case I repaired first, then went on to making it run. These old Honda's are very reliable and it didn't take a whole lot to get it running after making the exhaust, foot pegs, shifter, foot brake lever & a kick start. It ran great but SMOKED!!!
Called the owner and told him the issue and offered to transplant it again! I used a 1986 Honda TRX200SX (of course my engine of choice) but this required a total re-build of the frame for it to fit. I had to re-make everything again
Didn't take but a couple of days and fired it up & it actually functioned like it should
Now the "Hondasaki" was a reality, I was given some free plastics from a Honda CR125 & 250 to dress it up with. Now his bike is a semi-automatic,electric start,pull start,(has reverse!) and it was a great project for me!