Yeah I can see that, looks like its come off or blown off-might have been perished at the crimp.
Airbox lid I have brand new one of those for an ur, yours if you want it, ill see if ive anything else-I know ive got an oil line and some other odds and sods that might be useful if youre intent on putting her to rights.
Looking at it externally, I dont think its irreparable, Im certain you could get enough parts sorted to put it to rights. Hope youll go for it.
