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Posted

Hi.

 

I've recently inherited an old Stihl 08S which was a non-runner but has spark, compression but wasnt getting fuel so took carb apart and replaced the diaphragms and gaskets as the old ones were manky and hard but still cant get it to run.

 

It starts and just about idles with the throttle locked to half position but wont rev and just dies when the throttle is taken off lock.

I've tried adjusting the mixture with it ticking over but nothing helps.

 

Just wondering if you had any idea on what might possibly be wrong?

The carb is clean as is the fuel pickup filter and air filter.

 

Any help would be appreciated.

 

Thanks,

Richy.

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Posted

Are you sure the carb is clean?

 

Did you take the meter arm out and give that a blast and is it set correctly?

 

Seems you are lacking fuel. The plug should be nice and wet when trying to start.

Posted
Hi, what exactly is the meter arm?

 

It's on the bench thread.

 

It the meter arm and valve that allows the flow of fuel around the carb. If this becomes blocked it will not allow fuel to flow or if the hieght is wrong it will not allow enough fuel to get through. Or too much fuel.

 

Something like below. :thumbup1:

image.jpg.bc8e989fdef07c491c4c87b7aa9a3134.jpg

Posted

Sounds like you need to fault find.

 

Is the fuel line cracked? Is the impulse line ok. Is the spark nice and strong. Is the throttle linkage working right?

Posted

Make sure the L & H are one turn out, the carb is reassembled correctly, ht lead is through the right hole (if it's not, it can strain it and the spark will earth), check the engine timing, as this can be out if it's the earlier electronic ignition and also if it's points!

 

 

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