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Discussion Starter · #1 ·
Hey y’all! I’m still pretty new to the form. But I am building a 2012 cbr1000rr. I just got my cylinder head and cylinders back from the shop. They cleaned the cylinder head and adjusted the valves clearances. For the cylinders (jugs) they “cleaned it” and “decked” it. I don’t care how you clean. Or how you deck cylinders. But it’s not like this. It looks like they used a belt sander!!!! I’m so pissed. Am I I’m big trouble? I think imma go back and tell them to buy me a new cylinder head. Because that is ridiculous.
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One method of "surfacing" a cylinder head is to use a belt sander machine, it is crude but if they only took off a couple thousands then it won't cause any problems. If you have a large enough surface plate you can lap the head surface for a smoother finish. Depending on the head gasket you should be fine. A better way to surface a head is with a mill and a flycutting head.
One thing you can do is, if you have a die grinder, use a small carbide cutter in the water passages to smooth them out, remove very little material. If you don't have a die grinder than a rat tail file and a little elbow grease will do it. Use compressed air to blow out the head water passages afterwards.
Have a good one.
 

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Discussion Starter · #4 ·
Also, it’s less about the edges of the water jacket holes. And more about how it looks so rough and like it wont seal at all! I was expecting a smooth surface. Will that surface seal?
 

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That is unacceptable for MLS head gasket, which requires a fine surface finish. Also they ground off chamfer and didn't re-chamfer the bore so you'll have a hard time putting pistons back in. This is why typically the cylinder head is decked, not the block.

It should be reground on a surface grinder but this it's aluminum so need to send it to a shop like Millennium Tech that knows what they are doing.
 

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Discussion Starter · #6 ·
I just sent both the cylinder head and head to our machine shop that specializes in high-performance custom builds. They are going to inspect the cylinder head and make sure that they did the valves right. and they are going to check to see if I can fix what the other company did and if not I’m going back to that company to ask for a new cylinder
 

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One thing I would be worried about it how much did they shorten the cylinder case to have removed the chamfer. You will need to install the pistons to the rods and crank and measure how far down in the cylinder they are at TDC. You want a few thousands down or flush, but absolutely follow the service manual. Including the head gasket thickness you need enough clearance from the piston crown to the head so they can NEVER make contact. I built two-cycle racing engines a long time ago and High performance Chevy V8s more recently, You need to measure everything when assembling, even if it is a trusted shop.
 
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