2002 Yamaha TT-R 250 Logo

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Posted on Apr 13, 2009
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New slip-on FMF Powercore 4 on 02' TT-R250

I installed the FMF Powercore 4 slip on muffler and since then it runs like sh*t. I was told there are no aftermarket jets for this bike just oem, is this true? I am obviously pushing a buttload more air and not enough fuel so there's gotta be a way to re-jet this thing. If I bought just the stock primary jet could I drill it out to open it up to allow more air to flow thru carb? Please can somebody send some help my way. Thanx. RJ-Vancouver, WA

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  • Posted on Apr 21, 2009
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I looked up in the book for jets for your bike,i diden't see any.you could try to drill out the jet but they are brass.and very fragile.unless you are a machinest.also did you upgrade your air filter to go along with your new exhaust?

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