Engine won't turn over

the clunk and whirrr do sound like sprag problem but was it ok before you dropped it?? if it was I would start looking elsewhere first as that would be too much of a coincidence for me. I would be checking all wiring on that side of the bike to see if it is a loose connection somewhere. check battery connections are tight too and waggle the kill switch. while there check your sidestand and clutch lever cutout wiring is intact, tho I do not think this would cause the problem tbh.

 

a battery can show full charge but still be shot and not giving full power under load,ie starting.on my old cb500 the battery looked ok on the meter but would not start the bike, a new battery sorted it out

 

The clunk I don't know about.... The whirr is probably the injectors priming and the only thing that will prevent it turning over is the clutch switch or its wiring

 

Wondering if the lack of start after dropping it has anything to do with the tip sensor not resetting after you picked it up.
My Bonny has one and the t,internet says that the ST has one too!
Just a thought.
Jonester

 

was it running at the time when it fell over , just wondering because sometimes fuel fills the combustion chambers on certain models , particularly if they haven't got a tip sensor & locks the engine up solid . If you take the spark plugs out & spin the engine over on the starter , the fuel will jet out (watch your eyes) and then pop the plugs back in & it'll be okay . If this is what has happened then providing the engine stopped fairly quickly as this happened there will be no significant damage to engine parts , what can happen in extreme circumstances are that the valves get slightly bent

 

Glad you got it sorted, I thought it was just the 885i motor ( Tiger )that suffered from this problem as the breather feeds into the left side of the airbox, plenty of info out there on doing a divert to prevent future occurance