Try runnin a 155 main and a 42 slow jet. Set the air screw about 1 1/2 turns out and run the jet needle in the 4th groove. This is the set-up I run with a fmf fatty and silencer. I'm bored thirty over with a open element filter. No problems ever for me. This should get you close then fine tune with your air screw.
__________________ '86 TRX 250R -fmf pipe/silencer
-uni filter
-mx ported cyl.
-maier front plastic
-barnett clutch '01 BLASTER -bored .040
-shaved head
-lrd full exhaust
-injection block off
-k&n filter '86 LT50 -restricter washers removed
-pimpin rear tires
-ebay plastic
-found in the trash
-biggest smile from my boy (PRICELESS) '02 Artic Cat 90 -restricters removed
-20 mm carb
-opened up silencer
-removed clutch bushing
-removed oil resivoir  Procycle!!!
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