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will be on the fuel cap
however if you get Stihl special 50:1 oil it will not matter what ratio it is as that oil , properly mixed will cover all ratios
possible problem with dirt or blockage in the main jet of the carby
remove carby and blow out all holes and jets
fit new diaphragm
ensure that the oil / fuel mixture has not excessive oil in the mix
do not use e-mix fuel
I would check the oil/ fuel mix ratio as it may be too weak and the engine is starting to seize up
nothing over 50: 1 ratio and most will operate as low as 25:1 ratio
while it is running check to see if it is smoking at the exhaust
if not ,there is not enough oil in the fuel
This unit is designed for 40:1 however with the new better oils it can run 50:1 make sure the oil you mix is "FD" rated.
Better is to use the pre-packaged fuels they have the "FD" oils and 93 - 95 octane non-ethanol fuels.
Use the links below to determine your oil mix ratio:
You may contact the manufacturer, download manuals, check fuel/oil ratios, order parts, find your local service center, and view other resources using these links:
50:1 is 50:1 no matter whose 2 cycle mix you use. 50:1 is 2.6 ounces of 2cycle mix to 1 gallon (US) of gasoline. I recommend strongly to use a brand that contains fuel stabilizer. It will come in a 3.2 ounce bottle...still 50:1. The premium 2 cycle oils will be semi-synthetic or full synthetic and will claim "no smoke"
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