I recently swapped my 14mm bing for a 15mm clone from treats with the #1 Grandpa intake because my 14mm bing had almost every screw stripped on it at this point. The 15mm seems to have way less power in all areas compared to the 14mm. I was running a 76 jet with a 2.22 atomizer with the 14mm and now I have a 78 jet with the provided 2.17 atomizer. Just barely four strokes on the high end with the 78 which seems good. The slide is the second from the top I believe. I was hitting 37-38 with the 14mm but now I seem to be struggling to get to 35 on flats with the 15mm. It seems like it just hits a wall. I sprayed down for airleaks and fixed them. I put an o-ring in between the carb and intake to fix the main airleak. Has anyone else had worse performance with the 15mm? I'm seriously considering going back to the old 14mm.
70cc Treats Kit
70cc low compression head
Metal Mesh Air filter
Timing 16 degrees BTDC last I checked when I rebuilt the motor years ago.
Techno CIrcuit pipe