Buy a 600?
There is no way your really going to give a 250 alot more bottom end.. there not about that. The MC16 is held back more by its carbs not its electronics. You will get a better increase of power if you fit a set of MC18 carbs. There are a few people on the site that are in the process of doing that right now. Im sure one of them will reply to you.
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If I have to take the carbs off once more...