On NS400 all three crankpins is in one line, so vertical piston work alone, after 90 degrees two horizontal cylinders fired. Just center cylinder crank webs heavier.
Engine is on the rubber, stroke 50.6mm, angle V90, so I think this help eliminate vibrations. Both NS 250 and 400 didnt have any troubles with this.
NS500 and RS500 racers V 112 angle engine, separately 120 degrees firing, 54mm stroke and no silent blocks, so maybe more difficult eliminate vibrations . And double power output.
DRM guys made 500 kits for NS, with two EX ports and dry clutch
https://page.auctions.yahoo.co.jp/jp/auction/g298854497
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