Stihl FS100 Strimmer will only tick over please help.

Jakm15

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  • / Stihl FS100 Strimmer will only tick over please help.
Hi all, I have a stihl FS100 Strimmer with the 4mix engine.

When I got the strimmer it ran fine for a tank of fuel, then after that it began to run poor. It would run full throttle then start to bog down and cut out as if it could not draw fuel.

Now it will only tick over briefly and as soon as you touch the throttle it cuts out.

It's got 95RON petrol in and stihl standard oil at 50:1

I have cleaned the air filter, cleaned the spark plug, cleaned the fuel filter.

I have also stripped the carb and cleaned it. All the rubbers seemed to be fine with no cracks etc.

I have also tried the carb hi and lo screws in every possibly position.

It's in very good condition with good compression, I've had the head off and the valves are clean.

All I can think of is try running 98 RON with Stihl fully synthetic oil and fit a new plug.

The only other thing it does seem the leak a small amount of fuel from the breather on the tank but I can't imagine this would affect it.

Thanks in advance.

Jack.
 

Carscw

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  • / Stihl FS100 Strimmer will only tick over please help.
I will assume that since you had the head off you set the valves to speck.
Have you cleaned the screen in the muffler?
 
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