Are there any jetting gurus out there ? I have a 250 X with the typical throttle bog, I have learned to live with it over the last few years but got a new to us 150R today that does it even worse ! Both bikes are stock, Would appreciate any ideas..
Sounds like a jetting and air flow problem. These bikes are delivered really lean and choked down from the factory. Try opening the air box, and a JD jet kit. There is also an accelerator pump mod for pre- 2007 models that I've heard helps. My 250x was the same way until I opened up the breathing and jetted the carb. Hope this helps. X-Man