This is an old picture, tube from reedbox to carb now has a bend in it to put the carb more level:
Here is the line from the carb to the stock airbox, all covered in mud of course:
I am headed out to the shop in a few minutes, I get more pictures if you wish.
This is with a 39mm carb, stock for my KTM 250 engine.
The plastic pipe is standard plumbing drain PVC sized to match the carb inlet.
sorry to thread Jack but I e was wondering is 260 to small to ride in snow with stock blaster no air box lid an maybe a DG pipe could be stock? I p're mix also.