I bought a 2008 ST1300 several months ago from a friend. I loved the bike immediately except for one thing - it tended to yaw back and forth at highway speeds. Since it had 54,000 miles on it, I decided to rebuild the front end and see if that had any effect - RaceTech to get the springs right, lower viscosity oil to cure the overdamping plus new seals, bushings etc. Also replaced the head steering bearings with AllBalls.
Now the front end felt better, but still yawing around on the highway.
Felt like an aerodynamics problem - bike came fitted with a great big oversized windshield that creates a huge pressure differential in front of the rider - in other words, it tends to push you forward.
So, I decided to take off the (huge) Honda top box. Bingo - stable as a rock, even at 100+ mph. Evidently, the top box was acting like a wing over the back wheel!
I ordered a new windshield from Cee Baileys - the sport version. I may update this posting after I try it out.
Now the front end felt better, but still yawing around on the highway.
Felt like an aerodynamics problem - bike came fitted with a great big oversized windshield that creates a huge pressure differential in front of the rider - in other words, it tends to push you forward.
So, I decided to take off the (huge) Honda top box. Bingo - stable as a rock, even at 100+ mph. Evidently, the top box was acting like a wing over the back wheel!
I ordered a new windshield from Cee Baileys - the sport version. I may update this posting after I try it out.