Dang, sorry to hear this.What did I do with my ST1100? I ruined it. Not knowing the history of my bike, I figured some preventative maintenance was in order. It's a 95 with 60 thousand miles, so I figured a timing belt, coolant hoses and slave cylinder rebuild were a good place to start. I ordered the parts and printed off additional info found online, plus i have the Honda and Clymers service manuals to help. Over the past week I tore it down and reassembled with only minimal difficulty to be expected. started it up, no issues, put the tupperware back on and decided to go for a short ride since it was so nice out. I got about 6 miles from home and it started really rattling, i pulled in the clutch and it immediately died. I coasted to the side of the street and tried to restart it. Only it knocks really bad. Called my brother in law for him to come pick me up with his trailer and take me home. Got it home and hoping it was something simple, but already expecting the worst, well I tore it apart again, much easier the second time, and saw the tensioner spring for the timing belt fell off the upper retainer. The timing was approximately 1/4 turn out. I retimed it and tried to start it, but only a slight knock and wouldn't even attempt to fire. So that is how I ruined my bike. I don't know what to do? Should I part it out? Buy a replacement used motor? But new valves and replace them? I'm sick in my stomach since this happened.
There should be some ST1100 gurus here shortly.