| I had this problem with annettes sps, it would start fine when cold but was sluggish when warm. After changing batteries, checking for bad connections etc it turned out the flywheel nut was loose! if the it sounds like the clutch is knocking badly take off the lefthand side fairing and look through the timing winow on the flywheel case, if the nut is loose you should be able to see the flywheel wobbling at tickover.
It is possible that the starter is worn but our old 916 has done around 30,000 miles and still starts ok!!
dave |