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Stihl Fs91R Fuel Mixture
Stihl Fs91R Fuel Mixture. In this thread in this sub. Eliminate the hassle of mixing your own fuel mixture with stihl motomix® premixed fuel.

4 mix has very low vacuum and if ther is a small leak from re using old gaskets and it leaks it won’t idle for squat. The stihl fs 91 r mowed through a 5′ x 5′ square of this tough grass in 13.5 seconds. We recommend the following mix ratios:
It Has Ran Well, Starts Well, Has Enough Power, Larger Fuel Tank/Efficient So Fueling Is Minimized.
1 part oil to 50 parts of petrol, or 20 ml oil per litre of petrol. Powerful brushcutter for the lanscape professional with bike handle. Idle is 2,800rpm and only use bosch usr7ac spark plug gap is.5mm /.020”.
If You Adjust Valves Ever, Make Absolu Sure You Buy Thr $2.00 Kit With The Gasket Feeler Gauge And Washe.
#4 · may 5, 2011. Maybe a stihl service tech can quickly asses. It comes with a large 071ltr fuel tank to allow for longer cutting.
This Engine Runs An 2 Cycle Premix Fuel.
50:1 => 1 part oil + 50 parts petrol. The h screw controls the mixture when the trimmer is operating at full throttle, and the la screw adjusts the idle mixture. Here are some examples on how to get a perfect 50:1 mix:
Before Pouring This Mix Into The Fuel Tank, First Mix It Thoroughly.
If you’re using a different brand of oil, make sure it has the tc classification and mix at 1:25 or 40 ml per litre. The very small one will do 1 gal and the next size up will make 2 gals. We also ran these trimmers through a thinner, more typical patch of grass.
4 Mix Has Very Low Vacuum And If Ther Is A Small Leak From Re Using Old Gaskets And It Leaks It Won’t Idle For Squat.
To mix the fuel, first pour the engine oil and then the petrol into a suitable can approved for use with fuel. We recommend using a 50 to 1 fuel mix: The stihl fs 91 r mowed through a 5′ x 5′ square of this tough grass in 13.5 seconds.
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