Help on WR450 Header pipe

[mart50mfree]

Since iv fitted a new silencer on my wr, the stoick header pipe has started glowing red with the heat.....iv been told that its runnin weak and the jets need changing.....can any1 help me????

 

[splatt]

Sounds like you need to richen it up a little.

Steve

 

[mart50mfree]

im new to all this....how do i "richen" it up?