
Crunching noises not good....
Best bet is to whip the belt cover inspection plates off to see if the belts are in tact.
If so, try putting it in gear (2nd/3rd) and spinning the rear wheel to see if the pistons are free in the bores (not seized).
Then have a look at the state of the oil. Filler cap off and lean the biek over towards you. Use some kind of dibber to get a bit of oil and run it between your fingers. Any grit?
Further than that and you'll need to drain the oil. Might be worth doing so and whipping the l/h crankcase off to check alternator etc.
Good luck! If it has gone tits-up then it could be a good time for a 944 or Testarossa heads!
Cheers,
ali