Boxerworks.com

I think that the reason you don't see anything beyond 3rd bore is at that point you would be affecting more than just the pistons required. You would need to look at re-jetting, maybe even re-carbing, possibly cam profiles, valve sizes, etc to handle the increases. If it wasn't that I had heard abou...

Well, some replies are better than no replies...lol It was my understanding that the cylinders were all the same, just sleeved with different liners for the various bores. I have also been advised that the liners are hourglass shaped, thicker at the spigot and the head than in the middle. I just can...

I have a project bike I'm working on. It is a '78 R60/7. Bike sat for a long time on the sidestand and cylinder number 2 became corroded. My engine shop said they had to bore it out to 75mm to make it smooth again. So that puts it beyond second boring spec of 74.970mm. I know many have successfully ...