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Engine Tech
Engine Tech, Engine Technician
Category: Small Engine
Satisfied Customers: 14472
Experience:  Over 20yrs of experience in small engine repair.
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Why is Stihl chainsaw fuel mixture ratio higher than its variant?

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Why does a stihl chainsaw use 50 to 1 oil / fuel mix and the Chinees copies of the same machine use 25 to 1 oil / fuel mix

Hello and thank you for using JustAnswer.

The main reason behind this is Stihl's ratio is assuming you are using a premium gas and premium 2 cycle oil (THEIR OIL). If you use a cheap 2 cycle oil the ratio would be more in line with 25:1 or 30:1 even for Stihl. The chinese just want to make sure there (junk) is well protected. Also the steel and internals are a lot of times not the same quality so they do not want to take a chance at running that at 50:1...could make for a seized engine. So they are just being safe with the ratio's. If you run a better grade oil you could thin the ratio out on the chines one, but why do that if it runs good leave it be.

Customer: replied 4 years ago.

I was wondering if the chinese did not bother to coat the bore of their machines as do Stihl and Huskvana and thus need more oil to lessen wear or pick up. Bearings may also be of poor quality, as you say, and need more oil.

Everything on them is lesser quality and that is the reason they need more oil in the end as they can not run at the lean ratios without a failure.
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