Stihl FS45, HS80 and HS45-z All Stalling under Acceleration

Guyph_01 said:

Hi Guys,

I'm new here and this is my first post. A bit about me..., I like to play and tinker with any engines I can find, usually get them given from familly to fix or buy them not running, service them and get them running good and sell them and start over.

Anyway I have four Sthil machines that I can't get going and I have no idea why?? They all start and Idle fine but when you give them gas they bog down and stall. I have cleaned the flame screen in all of them, Carbs cleaned, worst ones I have put new carb kit in them, Also tried a cheap ebay carb replacement but always the same result, starts and runs fine but bogs down on throttle.

This happens with two FS45, A HS45-z and a HS80..

Using fresh fuel with all of them. Only cleaned the plugs.

What do you guys think? Or what should I be testing/ Looking for?

Thankyou

Click to expand...

bertsmobile1 said:

The low speed jet is adjusted wrong and most likely the throttle stop as well.

You need to decide if they are dieing from being too rich or too lean then adjust the low speed needle accordingly.

You should start by adjusting the high speed needle just slightly rich then after that do the low.
If the main jet is clean then you should be able to start a hot engine with the throttle wide open.
Take heed of what dfbroxy posted because the difference between runs like a pearler and wizz BANG ; scrap metal can be as little as 1/2 turn on a needle.

Initial settings are
FS 45; L-1 , H-0.75
HS 45; L-1 , H-0.75
HS 80; L-1 , H-0.75

If they do not start on those setting then something is very wrong

Click to expand...

S Haase said:

Thanks

Click to expand...

S Haase said:

Thank You

Thanks

Click to expand...