I'd lean towards having just the outer seal, too, cos of helpful diff oil prolonging bearing life, as CS says. I have found similiar situations in other machines; Stihl say 50/1 oil/petrol ratio for chainsaws, etc. After a couple yrs, u'll need new mains an piston on that ratio, as happened to me. Mechanic at concessionaires said run motor on 40:1 an it won't happen. 6 yrs later, his words have proved to be true.
While we're here, John you mentioned some engine mods that can be useful, could you outline them? Regards, Mark.
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