We Where the middle man on this job for another shop that he's was using we don't do yamaha, we made an exception because we where told it was a good core! the parts (cylinders)we got were unusable, we communicated every step with him and he seem to be good because he said he was away. we found good cylinders and sent it back with the power valves in the box. I think they threw them away with the packing paper so I found another set, We didn't charge any extra for any of this. I don't know what to do to make this guy happy,He just snaped. I'm already $485.00 in the red on this job. and I have the cylinders I could give you guy pics if need be.