Welcome aboard jet! Remove the fairing to get at the lever. I use a blow dryer to soften the grip. Insert a dull screw driver into the grip, and spray in some dish soap. Remove the screw driver, and you can work the soap around inside till the grip twists off. I also use GASOLINE to lube the grip for install. It softens the grip, and sort of glues it in place.I tried looking for a 150 manual, and so far no luck, but someone will make one avail. as it is a great scoot, and I believe there will be plenty of them around.