I'd think that 12 volts is 12 volts whether it's going thru a relay or not. I don't think it would hurt, but your corect in thinking it should be done right.
I prefer 32:1 with a good synthetic oil ie: Torco GP-7/Klotz R-50/superM.
2000 GNC 5N\
2001 GNC 9N \ 40+ class
2004 GNC 9N /
2014 rock crusher "GO tortoise GO!"
2016 Byrd Rooster
Father of the "11" time National champion,and worlds fastest woman ATV racer
A few fast LT80's
250R~300cc's
300ex
350 Rancher
Kymco Mongoose
Survivor of the 12 Hours of ATV America 04 and 05