Hello every one first time poster here, I recently restored a 74 mini trail 50 (frame off) and found when I put the air box and filter on the motor bogs down when you go above 1/4 throttle. If I remove the filter the motor accelerates just fine. This is the factory air box and filter. The filter had a lot of oil on it when I opened it so in my trouble shooting I removed all the oil from the foam filter and it still bogs down. I am using a aftermarket carb that I bought from CHP motorsports, other than that every thing is factory. Any and all help would be greatly appreciated!!! Also I would like to thank everyone here for the great info iv got over the past year reading this forum.