engine rebuild

I have a 1980 honda CT70 with a damaged right crankcase. Can I buy a 1978 atc70 crankcase and use that? I dont think there are any differneces besides the model numbers but i would like to be sure. Share your expertise!

Just acquired a early model CT90 in a trade. Bike is pretty much complete aside from needing the engine completely rebuilt (in a box, needs parts cleaned/evaluated) and the wiring all redone. I've never worked on these older horizontal engines only more modern high performance dirt bike motors...

Hello, I’m going to rebuild my ct70 k1 3 speed engine. I’ve rebuild hodaka 2 strokes but haven’t rebuild a Honda or a 4 stroke engine yet. I was wondering if there are any tips tutorials out there that may help me. I also need a place to send my head for the valve seats to get cut and my...

I split the cases on a K2 motor and the main bearings were easy to get out of the cases. It looks like they may have been turning in the races. I removed the crank with the bearings on it as well as the cam sprocket. Is this motor toast? How do you get the cam sprocket and main bearings off...

Hello Recently I had to open the engine of my Honda 1970 ct70 because it burned oil and I discovered that I had to replace the cylinder by a new one, but the question that I ask myself is that I have an aftermarket head that must be used with a flat top piston, but I also have the original head...

Very general question...my 1970 ct70 KO starts on the first try and runs okay. The odometer shows 4800 miles(I'm not the original owner). I top out at about 25 mph in third gear and it struggles sometimes going uphill. I'm considering having the engine rebuilt. I don't really care that it runs...

I was just given a '72 CT70. The bike is in various stages of disrepair but I hope it can be saved. All is there and needing clean-up/fix-up but the motor is in pieces - literally pieces. Former owner completely disassembled the motor and it all is in a box. He swears that it is all there...