what gas/octane for briggs&stratton 7 hp mower

[ziggy]

Have a briggs&stratton lawn mower, we got about 2 or 3 years ago. Was reading the owners manual, and it specs for 87 octane. However, ive heard others say to use 93 instead. Its a 7 hp mower. What would be the correct octane?

 

[Mike_dup1]

87, stay with what the mfg recomends. Higher octance fuel burns hotter and that is not good for a small engine. I have yet to see any small engine mfg recommend higher then 87.

I have a 13hp Tecumseh and it also says, 87 octane fuel only.

 

[CBDFrontier06]

Octane is little more than a combustion inhibitor, used to inhibit / prevent detonation in higher compression engines, especially ones with turbochargers. Your lawn mower engine isn't designed to burn this kind of fuel...so don't waste your money, as it's providing nothing but power loss to your engine. 87 is ideal for a lawn mower.

 

[tmorris1]

Higher octane fuel doesn't burn any hotter. That is an old wives tail. Put the cheapest gas you can in these engines because they are anything but high performance.

 

[NThomas]

I only use the premium gas in chainsaws and trimmers, machines that are running over 10,000 RPM.

 

[80caprice]

Have used regular, and high....
Only real problem I had was with a 6hp briggs (it was maybe 8 months old at the time) after switching from high to regular... it didn't want to cut off... wierd I know But it was more then likely the kill wire didn't ground off the bat.
These engines are not high compression engines.... and do not need high octane, its a waste of money.

 

[ziggy]

Gotcha thanks all I thought so.. its funny to me, because 3 auto mechanics in an online forum, had said to use 93 octane... thought it was odd thats all, and being their mechanics, well you get the picture lol.
But thanks all!

 

[tmorris1]

The only time I use high octane is because that is the only thing around here without ethanol in it. I never store anything for over a month with ethanol mixed gas in it.

 

[UNC038]

I use 93 in yard equipment that the gas will sit around for a while. After time gas loses octance, so I figure in 30-60 days it will be down a few points.