top end job

[IRISHCOFFEE]

need some help guys. what are you're thoughts on honing a nikasil (01-cr250) cylinder when doing a complete top end replacement? is this necessary? thanks.

 

[adstott]

try searching your topic. I think this topic was hottly debated in another thread.

 

[DKT735]

It's best to hone the cylinder. It will take all of the unburned oil and other varnish off the cylinder and help the rings seat. I generally hone the cylinder when I rebuild the top end.

On the other hand I've also done top ends where I was either to busy or lazy to properly wash the cylinder after honing so I didn't hone it. The bikes always ran fine and I didn't notice any power difference or excess blowby when the engine was torn down at the next top end.