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i have a 1974 kawasaki z1 900 completely stock with an exception of a 4 into 1 header. can anybody recomend what grade of gas to use, ( im currently running 93 octaine) thanks

It's the strangest thing, in my KZ900 I run the cheap 87 octane. I trien the super (92 octane) twice thinking I was doing something nice for my engine, but my bike threw fits.

Oh well, I guess it's saving me money.

Good luck.

if its stock 87-89 is plenty

Stock compression is 8.25:1 and the combustion chambers are relatively large. 87 Octane is plenty. Hi-test will only delay combustion and soot up your plugs and combustion chambers.

MY bike is an 82 KZ 1100 D-1 It's all stock including exuast. It tends to spark knock if you lug the engine . So I run major brand 89 octane. I been thinking of sending My carbs to WIREGEORGE to get them redone & maybe that would help this problem.`Also I want to get an oil cooler on there as I'm in south TX. [img

Post edited by: outatimeoutlaw, at: 2007/04/15 08:14

Post edited by: outatimeoutlaw, at: 2007/04/15 08:16