It is possible to convert an ST4/S4 crankcase to accept a SSA from and S4R or SBK it won't as standard accept one, a few on here have already done it. I expect someone will be along shortly to explain exactly what you need to do.
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Roast Beef Monster!
Termignoni and Bucci - Italian for pipe and slippers!
S4 Fogarty, S4R 07T, 748, Series 1 Mirage
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