the 944 is a great mod for the 900 2v motor. Keihin FCR carbs is also a good addition. i have both done to my bike and the result is a strong pulling, fast motorcycle.
as far as silky smooth it's not that. it has power across a v e r y w i d e rpm range if that's what you are looking for but with the bigger pistons, open airbox (do this), and gulping carbs it's all sound and fury when you crack the throttle. it's as it should be. it is as reliable as a stocker and has caused me zero trouble since the mod was performed.
i think all on this board will echo that it is a mod worth doing.
good luck.
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