Gearbox Engine Or Normal 2003 955i

So i have a 2003 Daytona 955i

Whilst pulling away sometimes i get a Light Rattle sounds, Almost sounds like a stine being chuck up into the plastic mudguard. or a small bit of metal being picked up in the gearbox/engine.

It hasn't got any worse, Oil was clean of sworff when drained and its only if i choose a little to higher gear to exit a roundabout slowly or junction or putty the engine under strain by giving to much throttle pulling away.

This sound only happens at around 1,500rpm doesn't do it when not in gear eg stationary. Confused doh.

Id normally say piston slap but it sounds lower than that, Gearbox is nice and smooth and doesn't slip or jump out of any gear.

 

tbh i think i may know what it is lol, The Chain slipper is worn right through, i think its the chain hitting the swing arm now and again.