I have to say I watched the tech install the new parts and he did an excellent job. He was very carefull and through. The base o rings were green in color and had squared edges. The reason they replaced the pistons and cylinders is because I was getting a knocking sound (like the rods knocking in an automobile motor) between 2500-3300 rpm when the engine was at operating temperature. No knocking when cold. The dealer had discussions with HD about this issue and they said it was caused by short pistons and the noise is considered normal, and it would not affect the longevity of the engine. I have a friend that has an 07 SERK that does not make this noise. So, when I took it in for the enhancement I asked them to warranty the cylinders and pistons. HD stand now is, they will only change the cylinders if the sleeves slip .006 period. My rear slipped .0045 and HD told the dealer they are now taking the stand that it must slip .006 or it is within spec. So, I called HD Cust. Service about this issue and made my case about the noise being excessive and my friend not having this noise. After allot of discussion they agreed to replace the pistons and cylinders with the understanding that they believe the sound will come back and I agree that it is normal. Also they said the only reason they are doing this is for customer satisfaction. I have to say I was impressed that they stepped up for me. Also the noise is gone for now and hopfully won't return. I am leary to have them tear it down again now so I am going to watch it to see if it gets worse. It is definitely leaking from the base not from a bolt.
I had the bike in 1500 miles before the enhancement came out because the heads and cylinders were both leaking. I also complained about the engine knocking sound. They replaced the gaskets, o rings and checked the cylinders, rocker boxes, and the tech said he did not see anything abnormal with the engine. They did not hone the cylinders or replace the rings. I noticed that the bike I was getting oil carry over into the air filter when I got it back. I went back to the dealer about the noise and oil carryover and talked to the service manager. He rode the bike when it was hot and did hear the noise and agreed that he did not think it was normal. He called HD about this and they told him they are aware of this noise between 2500-3000 rpm's and is caused by the short pistons. They said something like it is just an annoying sound but it is normal in the 110's and will not affect longevity. On a side note when they do the enhancement package they are supposed to do a leakdown test per HD instructions. When they did my leakdown test it exceeded the spec so initially they did agree to replace just the rings. I broke my bike in per HD instructions and have no oil carryover at all now.