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Throttle response

Discussion in 'Chainsaw' started by Conor Owens, Feb 2, 2019.

  1. Conor Owens

    Conor Owens ArboristSite Lurker

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    Hello. I have always the same problem.

    I have a hs87r trimmer, ms211c chainsaw, and hl95 long reach. I've replaced the diaphragm in all and now when I first start the machines from cold they won't respond to throttle untill they warm up a little. Then they run perfect, if I stop them and then restart then then they run fine. What could this be. They all have new sparks, ignition coil and magnet fine.

    When I say won't respond to throttle. I mean they are idling fine. Just won't rev up when throttle is pressed untill they warm up are I hold and realese the throttle.

    Any ideas will be appreciated!
     
  2. cuinrearview

    cuinrearview Red saw lover

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    My equipment is the same, to varying degrees. Gotta let things warm up.
     
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  3. Dahmer

    Dahmer Addicted to ArboristSite

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    I let everything warm up 20-30 seconds before running it, I ain’t important so my time isn’t real valuable.
     
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  4. WolfMann

    WolfMann ArboristSite Operative

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    Same thing these guys said, just give it a minute to warm up.
     
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  5. Andyshine77

    Andyshine77 Addicted to ArboristSite

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    Pretty normal for s cold saw to behave that way. You could open up the L an 1/8 of a turn or so, but for the most part, yeah just let her warm up.
     
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  6. mountainlake

    mountainlake Addicted to ArboristSite

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    Another vote for opening up the low a little, should start better too. Steve
     
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  7. Conor Owens

    Conor Owens ArboristSite Lurker

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    When you say"open" you mean unscrew anti clockwise?
     
  8. BangBang77

    BangBang77 The chair is against the wall...

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    Yep, turn the L counterclockwise.
     
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  9. Ax-man

    Ax-man Addicted to ArboristSite

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    I recognize the 211 number for the chainsaw but if those other numbers are for a Stihl be thankful they start and run with just a little warm up . Every summer I have a go round or two with my Stihl trimmer and every once in awhile with my power pruner. Drives me nuts ,seems the older Stihl stuff I have is more reliable to get started and going to WOT.
     
  10. Conor Owens

    Conor Owens ArboristSite Lurker

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    So I moved the L screw out. Was running great. It went cold and I couldn't get the thing started again to save my life. After 30 mins of playing with the L screw in different positions I got it running. Any ideas ?
     
  11. Ax-man

    Ax-man Addicted to ArboristSite

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    Probably nothing you did just a crummy design of the vergasser along with a fussy main nozzle check valve.
     
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  12. Andyshine77

    Andyshine77 Addicted to ArboristSite

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    How does it idle? may need to bump it up a little..
     

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