NFU Mutual Smallholding Insurance

Author Topic: Stihl strimmer problem  (Read 119 times)


  • Joined Dec 2011
  • Gascony, France
Stihl strimmer problem
« on: June 18, 2019, 10:19:46 am »
We have a small 2 stroke Still strimmer FS45- about 20 years old now. After the starter ring disintegrated taking the pull start mechanism with it we waited 5 weeks for the parts to arrive, so are a bit behind with work. For some unknown reason sometimes it just won't rev. Cleaned the plug but it made no difference yesterday, but tried again this morning and it didn't miss a beat. Now yesterday it was 28C and this morning 20C- perhaps there is an operating temperature limit, although there is nothing in the manual. We had a warm spell just before it broke and had problems then. Running with 95 octane fuel and Still 1:50 oil mix.

Has anyone else had this problem with a 2 stoke engine?
Voss Electric Fence


  • Joined Jan 2018
  • Herefordshire/Shropshire Border
Re: Stihl strimmer problem
« Reply #1 on: June 18, 2019, 10:48:43 am »
Could it be some crud in the carb? 

My Stihl Kombi has never suffered from what you describe and has been used in some VERY warm weather, but my old Husky chainsaw used to run like an old dog until I gave it a thorough service and carb clean.  It is good as gold now. 


  • Joined Jun 2013
  • South Wales .Carmarthenshire. SA18
Re: Stihl strimmer problem
« Reply #2 on: June 18, 2019, 11:04:51 am »
Sounds like the highly volatile oils in the petrol evaporated around the reed valves in the carb & thus made a glue of thicket than normal 2 stroke oil that either blocked a jet or restricted the reed valve movement 
 Always running the machine out of fuel at the end of a session ,  pouring  out any extra fuel into clean a store can with a lid if needs be before running it dry  helps tremendously .
It also helps stop thicker evaporated mix being present to clog the little filter on the end of the fuel line that is in the tank .

 When it next comes to filling if you haven't already used th stored mix else where  pour a little fresh made fuel in the can and fill up with that.

Do you used a " Fuelsaver"  , an additive you put into modern petrols & 2 stroke mixes  to stop it oxidizing and otherwise deteriorating ? Old petrol 2 months or more is not so good to make up a 2 stroke mix with , especially in warm climes.
Strong belief , triggers the mind to find the way ... Dyslexia just makes it that bit more amusing & interesting


  • Joined Dec 2011
  • Gascony, France
Re: Stihl strimmer problem
« Reply #3 on: June 18, 2019, 01:42:58 pm »
I'm using the red Still oil at the moment, but I have their long-life stuff which is supposed to be for keeping the mix fresh during longer storage. I always empty the fuel tanks on everything, just because of the fire hazard in an attached garage. The petrol for the mix I bought on Saturday, so it is as fresh as possible, but it is E10, so 10% ethanol and I wonder if that's a factor?

You are probably right about a good service Maysie- it's still on the original spark plug and air filter.


  • Joined Nov 2018
Re: Stihl strimmer problem
« Reply #4 on: June 18, 2019, 07:25:45 pm »
Sounds like fuel starvation - have you tried cleaning the air filter


  • Joined Dec 2011
  • Gascony, France
Re: Stihl strimmer problem
« Reply #5 on: June 19, 2019, 06:53:00 am »
Think you are right about fuel starvation Zyg because the more I open the throttle the worse it gets and it will actually cut out completely. The air filter looks clean and I have blown it backwards with compressed air to be sure. I wonder if it is some kind of vapour lock in the carb caused by heat?


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