Stihl hs80 and 064av too many pulls to start

[swinny]

I have a stihl hs80 hedge trimmer.... i bought a while back and used it once or twice and leant it to someone...... and i swear ever since i leant it to this chap it takes ages to start!! pretty sure it wasn't like that before it went!

 

I can pull it over for 12-14 times and have to play with choke on off to get it running.... its a single screw adjustment carb..... wound it all the way in and then back 1.... when running its mint and turn it off..... starts first time

 

Just fitted a new plug today also

 

 

 

 

 

 

064 av..... Looks to have had new pistona and pot but takes a fair few pulls to start 12 ish.... fitted new plug today and easy pull start....

 

It was low on fuel till topped up but i'm sure when cold it will be a pain in the arse again! Again, runs like a champ!! and can stop and re start no problems.....

 

 

 

not sure what to think, i was thinking impulse line?? but when running it'd run rubbish if impulse line was cracked.... What else can it be?

 

Fuel filter?? although would show signs when running...

 

stumped

[spudulike]

12 pulls is a bit excessive, generally a machine that has been run the same day or a day earlier will take 1 - 5 pulls, 1 is unusual but some kit will do it.

 

Things to check - carb fast idle start mechanism is working ok, coil to flywheel gap is not too large, impulse pipes are clear of dirt and gaskets/pipes are good, fuel filters are good, tank breathers are clear, needle arm in thecarb is set correctly, gauze filter in the carb pump is clear of crud.

 

I have a carb checking procedure I follow and it usually fixes 95% of problems and have yet to find a carb that actually needed a new kit on it.

[Old WoodChip]

Spudulike

What is the carb checking procedure you use out of interest