The first EC250Fs that came to NA were full-on EU homologated bikes that were totally choked up and had a muffler that you could stick your pinky finger in the end of. Those bikes ran like crap, plain and simple. I do know 3 people who have ridden the EC250Fs and they all agree that in EU spec, they suck. Jet them right and slap and muffler that actually flows air through and the bike works great!
1 guy I know put an FMF Powerbomb header from a WR250 and an FMF muffler on it and the bike rips.
The later build bikes that came to NA have come with an FMF Powercore muffler and they run like they are supposed to.
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