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next step is to put stock airbox back in. Do search here for "pod filters" and you'll find every single case is people having driveabiliy problems, stumbling, dying engine. When they put everything back to stock, magically bike runs just like stock bike off showroom floor.
Millions of racers have used Ninja 250s on track for past 33-years. Racers are cheating bastards who will do anything and everything to gain an advantage. And they know what works and what doesn't through tonnes of trial & error of millions. And they only do what works. Fact that not a single racer uses pod filters (even though they are allowed by rules) shows that pod filters just don't work.
When I had my bike dyno-tuned, we tried pods, we tried no filters at all. Not a bit of sifference! If the fans were aimed wrong at an angle, we actually LOST power with pods! Just shows that factory airbox and filter is not restrictive to begin with. Airbox and filter is same size as on my CBR600RR, a bike with 5x airflow and 5x the power. So airbox is definitely not a restriction on 250. The only time you have restriction is when you've got old dirty filter.
Stop wasting your time fiddling with stuff that doesn't make difference. The sooner you restore bike back to all stock condition with stock airbox and carb-jetting, the quicker you'll have well-running bike like brand new one off showroom floor. Yours ran that way at one point, then stuff changed. Undo changes from showroom stock condition and it'll run like brand new again.
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