Rode my 950sm (2006 my) to work yesterday, everything seemed ok. When I started bike up to go home all I got was the starter spinning up but the motor not cranking. Ivé had a sprag go before but they tend to announce their displeasure extremely loudly before finally going off in a sulk. Had no noise or trouble before this & it doesn't feel like a sprag. I'll be tearing her down at the weekend. Any ideas?