Question about 1984 kawasaki Z 650

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Can unleaded fuel be used in a Kawasaki Z650?

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  • iain kelly May 11, 2010

    hi,i would be reluctant to run unleaded fuel in your bike,the reason is,is that your bike was designed to run on leaded fuel (the lead in the fuel lubricates the valve stems) i would recommend a lead substitute fuel additive,this is a cheap and easy option and all but bullet proof,if you run the bike on unleade fuel and it is not designed for it,you will cause serious and expensive damage to the valve train...hope this helps...cheers


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Yes but if it starts to run a little different jst tune it to suit the unleaded

Posted on Aug 01, 2009

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Fuel recomended for 2003 kawasaki vulcan 800 classic

Hi, Anonymous excellent question, before I begin let me address motorcycles with valves and seats designed to run on leaded fuel issue, you can run unleaded fuel without a lead additive with no problem just replace the valves and seats with ones designed for unleaded fuel the next time you need a top end overhaul. In extremely rare cases some higher compression engines will ping using the highest octane graded unleaded fuel available in these cases the use of a lead additive or aviation fuel is recommended.
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Kawasaki z650sr 1979model

Premium unleaded gas is what you should use. If one or both cylinders is oiling up the spark plug it is time for a top end job. Have the cylinders bored then install new pistons and rings. While the head is off, lap the valves to get a new face on the valve and valve seat. This is minimal cost and very well worth it. If the gearbox is good, effectively, you now have a new bike.

Apr 30, 2009 | 1979 kawasaki Z 650 SR

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