IMHO, I woudn't lube the inside of the bar and throttle pipe w/ anything at all. Grease will drag it down and give a very sluggish response, WD-40 or something like that will actually "cut" into the metal after a while, and you'll get shavings and metal dust in your housing, very bad. As far as adhearing the grip to the pipe, install the pipe, glob some grip glue on the pipe all over, do the slide and grab dance w/ the grip, wipe off all the eccess, and safety wire it in at least 2 spots, you should be good to go. If you don't have grip glue, hairspray will work, just spray it into the grip first. It will slide on a heck of alot easier w/ the hairspray too! Good luck!-