A while back I pulled my chambers off to take a look at the pistons, and noticed that the top cylinder had some scratching on the exhaust side. So tonight I decided to pull the cylinders off and take a closer look at both.... This is what I found.

Top piston:


Bottom piston:




Bottom cylinder:



I was hoping I would just have to hone the cylinders and do the usual top end rebuild, but my friend caffeinejoe noticed that the top cylinder has a crack in the exhaust port bridge Can this be fixed? Also what's the diagnosis on the bottom cylinder, does it look badly worn? The bike did not seize, I pulled it apart to see what condition the top end was in.

The bike is a 28SE, with TYGA chambers, TYGA reeds, an MC21 flywheel, modded air box, and 152s on the MJ. I have been running BR9ECMs, 95 octance fuel, and castrol TTS oil. I live near sea level, and it's winter here so the bike has been used a lot in temperatures around 0 - 10C.

Check http://www.flickr.com/photos/45725426@N07/ for more pictures.

Thoughts, comments, advice please.

Cheers
Tom