Pan problems and a new four!

Over the last few months I’ve noticed a vibration on my 1991 Honda ST1100 and it has recently been getting worse, so I decided it was time to investigate the problem.

My trusty 1991 ST1100 has been my reliable workhorse since the winter of 1999 and has now covered 103,000 miles. I ride it quite hard and carry all sorts of stuff on the back in all weathers.

I set about diagnosing the problem by first checking when the vibration occurred and its frequency. It seemed to get worse as road speed increased and at around 70mph the vibration could be felt through the whole bike. The vibration