Hedge trimmer - full speed ahead

[Shane]

I am too old and dim to work out why my Stihl hedge trimmer is doing what it is.

 

Its an older single sided beastie (maybe an HS85 - label long worn away).

 

It starts OK and runs fine, but only at full speed???

The throttle cable is returning fine, the butterfly valve is closing but it will not slow down?

 

I used it for about 20 minutes today doing some 'clearance' and it was perfect,

except that it had to be turned off every time I put it down.

 

The choke mechanism seems to work OK - is it something carby? what should I look for.

Cheers

Confused oldie.

[Gary Prentice]

Not sure, but I think it's getting too much air (which I think is bad)

[spudulike]

With the throttle valve closing, it can only run on a fast idle and without much power. Sounds like a bad air leak or the throttle valve sticking open a bit.

 

What happens if you force the throttle valve closed by pushing it with your finger where the cable links to its arm?

[Shane]

Cheers Gary and Steve.

 

It seems to have plenty of power!!!

I will look at the cable quadrant/throttle valve tonight and see.

Maybe best leave it till tomorrow - dont want to upset the neighbours.