Was having problems with my 06 cvo 103. Think it is my pistons so took the motor apart and was gonna put in the pistons and jugs i took off of my other 06 cvo 103. Then when i went to put them on the pistons for my other one are tapered. I guess some of the 06 seuc had tapered and some were squared? I know one was built in nov i think and the other was in june. If i remember right could be wrong. Not having very good luck here with this bike. I didn't think they changed to tapered till 07 on everything.