Stihl hs 74 wont start

[Ric]

Thanks for the reply Ric, i checked that and it was a bit dirty but even if i left it out it does not even try to go, very strange as its been a very good machine working fine then nothing. Think i will have to put it in a repair place.

Let me ask and this is just a suggestion but does it have a primer bulb? If it does check the thing and see if it's cracked or has a hole in it. I had a trimmer that wouldn't start and I did about everything you have done and found the primer bulb had a crack and after I changed it the trimmer ran great. It's only a suggestion but sometimes we tend to over look the simple things.

 

[tanman34fl]

Never been big fan of stihl. They flood out real easy when starting,,in my opinion.
If you have spark try this with a good dry plug.
Pump the ball few times. Then choke the machine and pull 3 times. Shut choke off and pull like 20 times. Turn choke on pull 3 times. Turn off pull 20 times. Keep trying that. Pattern. If it fires turn the choke off and rev it up a little while you pull.
Good Luck!!
Tanman34fl

 

[EngineMan]

Never been big fan of stihl. They flood out real easy when starting,,in my opinion.
If you have spark try this with a good dry plug.
Pump the ball few times. Then choke the machine and pull 3 times. Shut choke off and pull like 20 times. Turn choke on pull 3 times. Turn off pull 20 times. Keep trying that. Pattern. If it fires turn the choke off and rev it up a little while you pull.
Good Luck!!
Tanman34fl

There is something wrong if you have to pull anything 20 times to start it, let alone another 20 times....!

 

[Bootsy]

Thanks for all the replys, still no go, it wont fire at all. Primer bulb is ok and full of fuel. I think maybe as it just stopped working ie no bad runing ect just stopped maybe as Mr EngineMan said it is the coil, i have seen on the net about with a old good spark plug break the arm off and see if the spark will jump that, i will give that a try and see what happens. Thank you all for your help and tips and anyone have any outher ideas would be grateful.

 

[Bootsy]

Sorry i just noticed i have put this in the wrong place.

 

[Bootsy]

Hi all, took the hedge trimmer down to local garage and got them to test compression and it was only showing 50 i believe from what i have read that means its knackered, got it home pretty fed up and thought that it still felt ok on compression so gave it a tug (switch set to off) then put switch to on, no choke, no priming and it started up and ran no problem, used three quaters of a tank of fuel and it seams to be going fine. Only thing was it started up in the kitchen and the wife was not to happy. When i checked the spark arrestor it was not to bad but i think i will replace it anyway and may look into getting a set of piston rings for it.