Engine is popping at high speed

[xman1998]

What would cause that other then it running lean? I have adjusted the high speed idle to richen but it still pops??

 

[Phill2]

What would cause that other then it running lean? I have adjusted the high speed idle to richen but it still pops??

Is it smoking now you've richened it?
If not it may be a blockage in the fuel line or carby.