New in box, $50 shipped. It's the one that goes aft of the carb slide. For Keihin 36-38 PWK AG.... won't fit my 2011 38mm carb with the black plastic spacer without modding it, so...
'11 250 race, my first GG...not familiar with what others came with. Mine has engine / v-force / carb manifold....so I guess no reed spacer? Thanks by the way for your jetting posts, good stuff.
It is the same principal that RB Designs applies but the Powernow is a 'slide' in and RB is installed permanent. It concentrates the airflow signature at low throttle openings. Kind of like having a 19mm carb for low end and a 38mm for full throttle- best of both worlds At least that's how I explain it
I bought one for my WR125 Husky. I was chasing a carb problem (so I thought).
Seemed to help a bit.
But the bike was plagued with other problems. Power Valve issues from the factory...for one.
So it was really hard to say that it helped lots.