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Does anybody know who makes a good big bore for the zr 700, or do you know any good mods so it can be competitvie?
thanks,
Dead Frost
 

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Wiseco makes 86 mm pistons to make a 790 and it is the same setup that PSI and Black Magic sell. It is best used with 44 mm carbs and use early 90's carb ignition. I have one that is ported by Lowell Horning but haven't used it yet. Setup makes 140-150 hp depending on final setup. Pistons come with instructions on how to properly machine heads.
 

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Also PSI's 890 and 950 kits for this engine rock. I have seen this setup go in mountain sleds and the new 900 1M can't touch them. Very expensive though.
 
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