Also, if the fuel jet is larger than the n2o jet, it's a fat tune up on a stock plate set up. The tunes they give you in the kit instructions are usually all fat.
Find a fuel pressure that is recommended or known to work, like 5-6 psi, tune it for that fuel pressure. If the pressure goes up or down the tune will change. More pressure makes it fatter, less leaner.
Stay away from overly fat tune ups.
Be careful in your prep, learn to read plugs really well and you will be OK.