Just got back from the dealer today. Had trouble with my 05 KZ 800 classic Back fire when cold and hesitation when warmed up. Started with high test when I picked it up new, after a couple tanks of gas is when it started to give me trouble. Dealer gave me stuff to pour into my tank with regular gas fill up and told me kz’s run better on regular gas, high test bad for the vavles.
2pyrs
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