I recently acquired a 1997 GL1500 aspencade and everything seemed fine on the test ride but after taking it out today for the first time I noticed that once I get past 70mph the bike starts to snake walk. My first thought was someone mix matched radial and bias tires but it looks like the tires are almost new shinko radials. I'm kind of thinking it might be steering stem bearings. But this being my first goldwing I'm not sure how they are supposed to feel but i'm sure that the snaking isn't normal. If someone knows what it could be or what common things might lead me in the right direction I would appreciate it. Thanks