BRP Rotax changed their manufacturing processes a couple of years back and the latest engines are produced using state of the art CNC machining. It means the repeatability and consistency is very good. This wasn't the case pre-2009.
There are many engine builders out there who will still tell you that these new CNC produced engines need to be 'fiched' or blueprinted - in other words, dismantled and reassembled exactly to the written specification of BRP Rotax - in order to be optimal in terms of torque and power delivery. But then all of these engine builders are financially incentivized to say this.
Yes there MAY be an improvement in a fiched engine over a brand new 2011 one out of the box, but it will be a] minute and b] a lot more expensive.
My advice would be to buy a new engine, get it set up right [i.e. power valve, jetting etc...] and just use it. If you really feel that it is too slow, then you can always have it fiched later.
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