have many options for mods, new head but get one so you can adjust the domes, so you can increase or decress compression, new prop for the ski, and i would add a primer kit for the carbs, you can go to GroupK.com and read about many of the things they do to ski's and i have had them do carb work for me, great pricing and great service. They have alot of tips on site that work and don't work, and they know their stuff, if they say it won't help your performance than DON'T waste money doing it.