Shaving head.

[Fastassbanshee96]

I've been working on restoreing my brother inlaws 250r and he wants it faster. We raced the other day and he was pretty sad... He has been looking into a cool head but has been having a hard time finding one. I told him about shaving the head but to tell you the truth i don't know too much about it myself. How much does it cost? How does it compare to a cool head? How much should he get it shaved? I know this isn't a 250r forum but I don't know any.... I told him I would try to look into it. He mostly rides trail or dirt roads. Once in a while we will go to the dunes or race eachother or some of our friends. Any help would be great.

[BellicoseBanshee]

What is the current squish clearance?

 

The stock head gasket for the 85-86 ATC250R is a three layer metal gasket. The first and third layers measure 0.009" and the middle layer is 0.020". A stock head gasket for the '89 CR250R is a one layer metal gasket, and it measures 0.009" thick, and it is the same size on the cylinder as the ATC gasket. If the TRX has the same three layer metal gasket as the ATC (I am pretty sure it does), you may want to consider trying a CR head gasket. Very easy and cheap way to lose 0.029" of wasted space...

 

Make sure the surfaces are flat and without blemishes. The gasket is pretty thin and will leak much easier than a stock three layer gasket. If you do choose to use a CR gasket, it is a good idea to have a back-up just in case it leaks...

 

I have heard of people separating a stock three layer gasket and using one of the thin layers as a head gasket. I haven't really looked into that, but it may be a possibility...

 

Another thing to look into is having the stock head machined. Check out Wildcard Racing. The 250R Cool Head I have uses a head gasket rather than o-rings, and works just fine, but is more expensive...

 

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