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Old 08-30-2010, 04:50 PM
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firffighter firffighter is offline
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Join Date: May 2008
Location: Boring, OR
Posts: 714
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Initial review from TBM on the EC250f was also that the bike was restricted and they couldnt sort out the jetting. They could not come to terms with the engine.

Second test was with a DP pipe. They liked the results, but felt the Yami had more snort with the stock pipe.

One thing about these Yami's, 450's included, is that they can be a pain to jet and get dialed in. I had a WR450 last fall and it took some time to get sorted, but once there, it would rip your arms out of the socket.

With my Yami (really my sons ), I uncorked it, put on a FMF pipe, removed the AIS, re-jetted, O-ring mod, AP setting, the works, and the bike has no hesitation whatsoever. It will lug all day at idle, then twist hard and it rips without a hickup. I have only stalled the bike twice in very technical boulder fields with my brother on his EC250 smoker stalled right behind me.

Yes, these 250f's do take some tinkering to get dialed in, but once there, are very effective. Reminds me of jetting a 125 2-stroke.
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