I had the opportunity to ride a 08 1800 goldwing trike just like mine and couldnt belive the differance in shifting. His being much much quiter and easy than mine. I ask what he did and this is what he told me. He said after oil changs with 10w 30 full synthetic, he did not fill crankcase completely up. said he mixed 4oz of trans slick 50 and 4 oz of crankcase slick 50. Finished filling crankcase. Said he was told by a honda Tech several years to do this and it has and is working very well. Ever heard of this?