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To answer your question... because I haven't made enough power out of this thing yet. To answer my own question... it appears you can in fact run a 90-95 dr250 cam in the gz250 as the heads are the same. While the stock dr250 cam is going to give more power, a cam shop is going to grind me a one off cam for my bike to give better mid to high rpm power to compensate for the 17t front sprocket I'm running. They're also going to set me up with with titanium retainers and double sprung springs etc for a dr250. The details really tie into my 300cc thread. I just created this to try and find someone that maybe had this experience before.
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