its 32:1 , i had a 2000 CR250 but had to sell it last summer due to fund problems. i used to use AMSOIL 100:1 premix, but i ran it at about 50:1 with 94 octane gas, and never had any problems, no overheating, and compression stayed wicked, i checked it weekly during riding season over the 2 years i had it
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