Not sure how much more power a standard ST2 makes? but boring the M900 to 944cc (+2mm) and fitting hi-comp pistons & FCRs will give a noticeable increase without losing much if any reliability and having to modify too many other things.
This is basically what I did (with the addition of a few other engine mods) and my bike has a really big punch from low down.
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M900, 916, LeMans II.
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