I don't really believe in cutting a good plug up to check my jetting but I do check my jetting by running it in different specific throttle settings and checking the color of a used plug. I give it full throttle after second or third gear and run it out to check the main. If I am on sand, wheelies are not usually so much of a problem. If you have got the pilot and needle adjusted use the now proper color light browned plugs and do a short run on the main, if they lighten up or turn white you are too lean. Sometimes you will get a back fire out the exhaust if you are too lean when you pull the clutch in and kill the ignition. If the plug is still the proper brown after the short run give it a longer run, sometimes I will make two or three passes before I pull the clutch in and kill it to check the plugs.