Hi SimRice,

Michael (Rolla) is spot on, with that engine date, your machine fits the time frame and would be an all original machine. wink

With regard to the chains and sprockets, the inner cutter sprocket and the small top primary sprocket are nearing the end of their service life, though serviceable at present.
If you replace these in the future, you will need to purchase a new primary chain as well, as it is pointless replacing sprockets and using an old chain....the sprockets would wear unacceptably in no time. wink

Regarding lubing the chain, I, personally use marine grease on mine..it tend to repel water and with my particular chain case, I get very little dirt or clippings in there. My machine is still on its original chains and sprockets.
I have not heard of the paraffin wax method before.
cheers

Please do not PM me asking for support. Please post your questions in the appropriate forums, as the replies it may receive may help all members, not just the individual member.
Kindest Regards, Darryl grin