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Discussion Starter #1
Well I have z400 and a +5 stroker crank,I had 94mm cylinder & the 12.1 je piston before the crank bearings went bad,so I put the crank in the cases and put the je back in to see where the piston would stop.with the piston on the rod its higher then the cylinder,also have a new vertex 94mm and it dose the same,so do I have to have a custom 94 mm piston made?cause vertex only makes a stroker piston for 90mm. Kevin
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20210315_163135_HDR.jpg
 

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Yes, you need a stroker piston for that crank. I think CFM may have one. Give him a call.
507-632-4666
 

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Discussion Starter #3
Thanks for the help,he thinks that they quit making the +5,but I see em for sale all the time unless they're old stock,either way he said call max power rpm,they have the 470 kit but it's +3 stroke not + 5,maybe they have 1 they can sell me 1,if they can't I'm buying the +4 cause I have a new 94mm vertex piston & cylinder already thinking it was the +4
 

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I would go 470 (462) kit all the way, tons of stuff for it, if you are swapping cranks..
 
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