transmission snatch or fuel mapping

[tomtom]

years ago before power commanders, you had to find a nice empty long road and gun the arse off the bike, pull the clutch in and do a quick plug check. I Used to find that cheap plugs misfired more than high quality versions when pushed to the limit doing plug chops.
Nowadays it's a lot harder if you want to keep your licence and todays bikes always seem to have hidden plugs that take ages to remove.
Thanks for the advice.