i am on the road with similar weight, all i can say is throw the standard chain away and get yourself a DID x ring chain, mine hasn't stretched at all yet, 4000kms, but had one on my XR600R back home, used the bike evry day commuting pulling wheelies all the time and also off road and it was still great after 16,000 kms... got a couple of spare split links and bought a chain with 118 links so i would have some spare bits just incase... i think standard is 108, 520 pitch... , its expensive but imho worth every penny...
safe travels
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