reluctorvalve Posted September 19, 2008 Share Posted September 19, 2008 I am rebuilding an all-original running 1977 YZ80D for my daughter for a Christmas present. Wondering, when I check the Service Data Sheet on the Yamaha site, for fuel type used is says only "Premium." It's an old 77--- is it supposed to take LEADED gas, or is UNLEADED fine? And, I'm gathering I have to mix 2-cycle oil at a ratio of 20:1. I'd like to verify this and know whether I can use UNLEADED...thx in advance. r. Link to comment Share on other sites More sharing options...
Moderator Cynic Posted September 19, 2008 Moderator Share Posted September 19, 2008 Leaded/unleaded is meaningless in this instance its a stroker so there are no valve seats to damage, i would say that as its a race bike it means run on the full fat 98ron super unleaded. As for the oil, if thats whats on the data sheet then that would do for me..... Link to comment Share on other sites More sharing options...
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