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Calling all you stihl guru's! I have a stihl FS55R that refuses to run!
I have spark. I have 110 compression. Muffler seems to be flowing as it should. Brand new carburetor, fuel lines, fuel filter, and spark plug. I'm stuck in a rut -any suggestions would be greatly appreciated!!

Did u check the spark arrestor screen or are u flooding it . What mix ratio are u running?

I would imagine a Stihl guru will help you but since he cannot see the unit nor has he ran it lately you will make it much easier for him if you provide more information. Start from the beginning more or less. When the problem started, before you began to make repairs.

Spark arrestor has been cleaned. The engine is not flooded as far as i can tell (spark plusg not wet). I use stihl 50:1 full synthetic on regular 87 pump gas

Grant11 said:

Spark arrestor has been cleaned. The engine is not flooded as far as i can tell (spark plusg not wet). I use stihl 50:1 full synthetic on regular 87 pump gas

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Does the spark plug get wet say after 20-30 pull's if not its fuel. have you seen it wet..?

I have a friend who works on Stihl and he bings a box of coil's to me to test, he tell's me that they have spark but over 90% go into the bin, test coil with a multimeter. you never know.
You have compression, all you need now is fuel and a spark. we need more info, like how was it running before you started work on it.

I run 34-1 93 octane never had a problem

EngineMan said:

Does the spark plug get wet say after 20-30 pull's if not its fuel. have you seen it wet..?

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The spark plug is NOT wet. I have a brand new carburetor so I kind of ruled gas out. Dumb mistake, I'll keep moving forward on fixing this. It wouldn't start with a squirt of starter fluid in it though.. Not even a few cough's when you would pull the chord

EngineMan said:

I have a friend who works on Stihl and he bings a box of coil's to me to test, he tell's me that they have spark but over 90% go into the bin, test coil with a multimeter. you never know.
You have compression, all you need now is fuel and a spark. we need more info, like how was it running before you started work on it.

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How do you go about testing a coil on these?

I have the same question. How do you test them with a multimeter.

A quick test with a multimeter is to put one lead on the small wire from the coil (kill wire which is used to switch off the engine) and the other to the metal part of the coil, if you have continuity between the two, put it in the bin..!

And don't forget to get the clearance between the coil and the flywheel right.

The symptoms suggested an ignition rather than fuel related fault. With the latter you would expect at least some coughing and spluttering. But then who am I, just another "Old Fart"