Originally Posted by JamesHealey

Engine tune is an art, get help at the track from someone who is experienced if you're struggling.

You want to be blowing white smoke, have good top end performance.

The bottom end response wants to be crisp, but you want it to idle well.

Be within 200-260f depending on the engine, temperature is purely just to check the engine isn't cooking it's self.

The plug wants to look nice shiny, undistorted and be ever so slightly wet to touch.

Be aware though!

If your clutch settings are off, you're never going to get a good tune.

If your plug is old, you're never going to get a good tune.

If you have a pipe that is too long or short, you're never going to get a good tune.

If you've got a damaged engine, you're never going to get a good tune.

If you've not got good seals from your exhaust gaskets, you're never going to get a good tune.