Quote:
by ih782dmike
Dale, I dont think unleaded fuel was avaible when the 70 or the 73 for that matter was new was it?? I think that manual is updated for more current times, I bet a vintage maunal from 1964, the vintage of a model 70 doesnt say that.
|
I'm not sure when unleaded gas made it arrival at the local gas station. I think unleaded gas was here before leaded gas was. The lead was added because some motors were having valve problems. Most if not all K series Kohlers have a harden valve and seat that will work with unleaded fuel.
A vintage manual may state the fuel requirements as being leaded gas. The infomation I posted is the latest infomation from Kohler. Running a lead additive will leave deposits in the combustion chamber which can lead to a sticking valve and the need to decarbon the head sooner.
My current shop manual is at least 10 years old. It has the same fuel requirements as my post states. Fuel techonology has change since the 70 and 73 came out. I've owned my 149 the longest. That motor was in boxes when it came home 8-9 years ago. Only fuel that my 149 had in it was unleaded fuel. I've never had a fuel related problem with it.
If I have my choice between a old manual and tha latest recomendations from the manufacture that made the motor on which fuel to use.....My choice is the latest recomendations. All small manufactures have to be testing their motors with current fuel(s).