This past spring I sent my cylinder and head out to Eric Gorr for him to shave the base of the cylinder and recut the head for pump gas. Before I sent it out my squish band was .084 just like everyone else's 05-07 250. I asked him to take .030 off the cylinder. Anyways I have been experimenting around lately and was tinkering with the idea of getting another stock head and just running race fuel. Reason being is I'm having a hard time getting the bike jetted just right and seem to have a small bit of knocking at certain times. I have tried to jet this out but haven't had much luck. The plug always comes out black and yet the motor seems a bit lean. Anyways I decided to take the head off and remeasure the squish to see where I was at before buying a new head. I know I should have done this before assembling everything the first time but I didn't. I took three measurements and got .0685- .069 on all of them. I'm using a cheapo micrometer so that may just be an error with it. I'm kind of a little bummed because I figured I'd be down around .050- .055 after the cylinder and head work. I noticed it looks like Eric cut some more material out of the squish band and then cut an angle up in the done to get me back on pump fuel. Now my question is can I simply take my head to a local machinist and have him take .019 off the bottom of the head? That would put my squish down around .050 which is about ideal I hear. I don't know what this would do to the dome in reference to compression, but I don't mind having to mix race fuel or go straight race fuel although ideally I'd still like to not HAVE to. I've posted up a few pictures of the head and I'm hoping some of you experts here can lead me in the right direction. Am I better off buying a new head and sending it out to RB Designs to have him cut the dome for pump fuel? It now makes sense that I can't get my jetting perfect with this large of a squish band. Thanks for all the help! Oh and one more thing I forgot to add is that I forgot to measure the depth of the squish band on the head, but did compare it with that of a quarter and it is almost exactly as deep as a quarter. I will try to get an exact measurement tomorrow night but there definitely is enough material there for .019 to be removed. The outer edge of the piston just ever so slightly protrudes about the top of the cylinder. I'm thinking that however much Eric took off the bottom of the cylinder he put almost that much again back into the squish band on the head. I wrote all the details out for him on the paper, but I honestly don't think he read them because just by glancing at the cylinder bottom it looks like he took a good bit more than .030 off the bottom. I have not measured that either though to confirm. Just looked like quite a bit with the naked eye. Maybe he was concerned by taking that much off that he needed to make up some of the difference again in the head. Wow I'm sorry for rambling on, but I want to give as many details as possible.