81K and 81 Custom- are pistons and cylinder same?

[motorbiketim]

I have an 81 Custom that I think is going to need bored out because it was rusted up from sitting outside. I have found a set of pistons and a cylinder assembly for an 81 750K. Are these interchangable???

Thanks for the input!

Tim

[Rick V]

 Yes they are. Most of the 750  engine parts are the same from '79 on.