evo heads
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Intermediate
Joined: Jun 2007
Posts: 40
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evo heads
OK, I have a 91 fxr with a 80in evo. Here is my question. I think the previous owner had the top end modified and I need to find the stock values in order to move forward in my build. I believe the heads may have been decked. Is their a stock head measurement that I can refer to? Also, What is the stock cylinder bore diameter? Thanks
HDF Community Team
Joined: Dec 2005
Posts: 5,404
Likes: 2,605
From: NC USA
OK, I have a 91 fxr with a 80in evo. Here is my question. I think the previous owner had the top end modified and I need to find the stock values in order to move forward in my build. I believe the heads may have been decked. Is their a stock head measurement that I can refer to? Also, What is the stock cylinder bore diameter? Thanks
Maybe some of the other guys have a better figure and don't quote me on this as I can't remember where I saw this figure and may have even dreamed it, but seems the combustion chamber is about 82cc.
I don't have spare set laying around but seems that when I measured at the spark plug side, from the bottom of the head bolt washer counterbore to the gasket surface, it's 1.25"
Cruiser
Joined: Jul 2008
Posts: 122
Likes: 0
From: Cape Breton NS
Very good advice there....factory service manual is the best one to get & parts catalog.
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