Whats the correct fuel oil mixture for a 1990 Kawasaki kx-125?

Answer I have a 1993 kx 125 and found that the owners manual says to use premium gas (90 octane or higher) with a 32:1 mixture but I found if I used premium pump fuel with 32:1 it would fowl out the spark plug with oil. I would recommend using a 40:1 mixture with premium gas but if you want to use 32:1 you should probably get some race gas (100 octane). This should run fine.

Using the premium gas with a 40:1 mixture will call for more frequent piston/ring/cylinder replacement but it won't be much of a difference.

For as long as I have been riding the mixture ratio of a KX125 is 32:1 don't let anyone tell you different.

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