what octane

[albass]

What octane gas should I be running in a 1991 Johnson Faststrike 150 ?

 

[JB]

Re: what octane

87 octane unleaded regular, twitch. Alcohol-free if you can get it.<br /><br />Good luck.

 

[js361]

Re: what octane

I recommend higher octane 91+ (tip: Holiday gas stations have 93)....it's cleaner & burns more efficiently.

 

[Dhadley]

Re: what octane

Actually with todays fuel in a stock recreational outboard the higher octane will not burn cleaner. It also raises combustion temps compared to 87 octane. The 60 degree motors are kinda sensative to combustion temps. Too much octane combined with anything else that promotes excess combustion temps (lugging, wrong spark plug. timing, cooling system issues etc) can sometimes prove fatal.

 

[walleyehed]

Re: what octane

93 flat killed our 175 Looper last summer, and after opening my eyes to the octane game and looking at the problems we have with radials running 100 octane in an engine designed for 80/87, I now realize the damage that can occure with high-test fuels..<br />As Dhadley said, 91-93 oct. is not needed or recommended but in a few High compression outboards, otherwise you're just waisting money and not doing your engine any justice...87 fits the bill, both the wallet and engine demand.