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  1. #1
    jonny5's Avatar
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    How far can ya bore before case and head work..? 951

    Was wondering how far can you bore these 951 motors out before head and case work is needed.

    Also what seems to be the popular choice for rebuild kits.. Pro-x..?? Wiesco ??

    Thanks


  2. #2
    jonny5's Avatar
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    No one Just bore and go lol.

  3. #3
    Kidd800XP's Avatar
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    You can go up to 89.50 if I remember right. If you go 91mm all you need is have the piston skirt cut to make room in the crankcase and have the head re-cut. Bill @ watercraft magic has a head gasket that you can run a stock head with the 91mm pistons.

  4. #4
    jonny5's Avatar
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    Thanks thats a start anyway. Just nice to know before I actually tear down. More info the better. Do the rave valves have to be cut every size over ...or are they good for .25'rs over or .5...?? Dont remember much about these but the more I tinker with mine the more I remember from the shop days. Already got a few things done to mine ....

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