Time to replace sprocket or not?

So, when to replace??

I've got a trip coming up to Limpopo in March, maybe 1000km. Then another in April down to the EC and WC, maybe 4000km.

I don't know how much life is left in this sprocket. I changed it not too long ago and if I remember correctly it is an aftermarket one, from startline. I haven't yet checked the front sprocket or the chain properly. But, for now,  lets say they are still ok, seeing as they are OEM sprocket and top X/O-ring chain.

Don't really wanna change the back just yet, I'm still in for yet another set of tyres for this thing - shit, it never ends.  :

AND I managed to blow the shock again this weekend. I had it fixed at RaceWorx eight months ago so I'm assuming they'll come to the party this time.

AND I've just spent my last loose cash on tyres and mousses for my 450

Fuckit, I'm bleeding, boys ..........................  help ............................