23 thoughts on “STIHL TRIMMER REPAIR how to adjust the valves on a 4mix stihl trimmer

  1. JEREMY
    I HAVE A 4 MIX KOMBI STIHL THAT IS VERY NEW AND I DID THE (PICK UP THE MACHINE BY THE STARTER HANDLE COMPRESSION TEST) (AS RECOMMENDED BY A STIHL TECH AT THE FACTORY) AND IT PASSED WITH
    FLYING COLORS.
    I ALSO JUST ACQUIRED AN  HT131 4MIX THAT LOOKS WORN, BUT YOU NEVER KNOW WHAT THE INTERNALS ARE. I DID THE STARTER HANDLE PICK UP TEST AND IT WENT STRAIGHT DOWN WITH NO RESISTANCE AT ALL. I THEN DID A TRADITIONAL COMPRESSION TEST WITH A QUALITY COMPRESSION TESTER, AND WITH THE THROTTLE OPEN, IT TESTED 160PSI. GREAT RIGHT. SO NOW I AM CONFUSED. MY KOMBI IS A OLDER UNIT—-DOES IT NOT HAVE THE DECOMPRESSION VALVE POSSIBLY, AND THE NEWER BUT WORN HT131 HAS A DECOMPRESSION VALVE (HENCE NO COMPRESSION RESISTANCE ON THE STARTER HANDLE DROP TEST),
    WHAT ARE YOUR THOUGHTS.  I REALIZE THAT THE BEST TEST FOR A 4 MIX IS A CASE LEAK DOWN TEST, BUT
    I DON'T HAVE  A LEAK DOWN SETUP..
    BOTTOM LINE, IF THE VALVES ARE ADJUSTED CORRECTLY, WHAT IS THE BEST INDICATOR OF A GOOD OR BAD 4 MIX ENGINE INTERNALLY
    THX MUCH
    STEVE

  2. I just bought an used Stihl fs90r trimmer with a crack primer bulb and the last owner said he couldn't get it to start even when the primer bulb was good. Any ideas on what the problem is?

  3. Hello thanks for the great videos , can you tell me your experience with a stihl string trimmer suddenly using to much fuel,, runs good just began using excessive fuel

  4. I have a km 130 r and I put a carb kit in it and I adjusted the carb and it was running okay until I turned it on its side can you tell me what you think the problem is

  5. That's a strange way to adjust valve lash. I would never had thought they would use the rocker arm bolts for that.

  6. Help MEEE! whats the seal called the one between the gauge head and the gauge cap (stops it from leaking) mines corroded needs a new one, can i use a rubber/glue substance or will it go wrong with heat from the engine. its a stihl fs 65-4 4 stroke

  7. Does a Echo GT trimmer have that compression release part that makes it feel like it has to much compression? I have one that has that issue as well some other tools that have different issues which cause alarm when running or make it not operate well enough to make the tool count for anything but parts and I haven't a clue what to do about it since shop time is so expensive and many aren't worth cost of diagnosing and any repair that could come no matter what it is. Thanks

  8. Jeremy, do you know the proper proceedure for performing a compression test on these 4 Mix units? Explain please… Thx…

  9. E4 Swisher/Shindaiwa line trimmer. Told by mechanic that intake valve stuck, not worth cost of him repairing. Is it possible to do it myself without any special tools, or too complicated/not worth the hassle? Thanks.

  10. mine runs perfect but it's very easy to pull should I check the valve's ? had it about 5 years zero issues but I've never checked valve's in it.

  11. thanks for an insightful video. I have a problem with my strimmer. It stalls when I open and keep open the throttle to full. I have to keep "tickling" the throttle to keep the machine running.
    I have an FS100R 4 Mix.
    Thanks for any advice you can offer.

  12. thanks so much for posting this video. I can't believe that I have owned my FS100 for 7 years and never realised it was a 4 stroke!!

    adjusted the valves just now and it starts easier than ever.

  13. we have Stihl fs130 weed Wacker and it has a tough time startering and when it does it doesn't run well at all. I'm thinking this is a valve issue cause when it warms up it is good.

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