Chopped plug

Hi all this may be a stupid question but I have read in here quite a lot about ‚chopped plugs‘ What is a chopped plug and how do you do it? What are the benefits of doing this to a plug??

If you want to test if you are running rich or lean you do a constant speed, say 55mph, pull over and quickly take out the spark plug and check its colour. Its particularly usefull for geting the correct size main jet

Thanks MTL make sure you join up mate!! But what is a chopped plug!?!?!??!?!?!? hahaha

Cheers lads,
I shall have a go at that as I am always trying to improve the set-up!!
Ride safe all
Nick ;D

Nice site!