How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask ranwell1 Your Own Question

ranwell1
ranwell1, Small Engine Technician
Category: Small Engine
Satisfied Customers: 10304
Experience:  Owner of Large Small engine repair business. Over 39 years. Certified both 2-cycle and 4-cycle engines
18770454
Type Your Small Engine Question Here...
ranwell1 is online now

I have a stihl fs360 strimmer, it starts and from cold can

Customer Question

I have a stihl fs360 strimmer, it starts and from cold can be throttled up to max. As it gets warm the engine starts to bog down on wider throttle openings, if you held the throttle lever all the way in the engine stalls.
Any ideas.
Ps when it is bogging and you leave it to return to tick over you can get a clean rev out of it once then it bogs again
Thanks clive
Submitted: 1 year ago.
Category: Small Engine
Expert:  ranwell1 replied 1 year ago.
This sounds like the exhaust ports are clogged or the spark arrest0r screen is clogged in the muffler.When this happens, it restricts the exhause gasses from comming out properly .Check the spark arrestor screen to see if it is clogged and if it is clean the carbor frm the scree with a wire brush or replace the screen. It is clean then check the exhaust port. You will have to take the muffler off and look inside the engine exhaust ports and see if it is clean. A clogged screen or ports will cause the bogging down and lack of power.While you are there, look at the piston and see if there is any scoring on the piston. If the piston is scored then you will need a new engine. The scored piston will cause the engine to bogg down and lose power because it is bypassing compression.If none of the above things is wrong, then I suggest that you have the carburetor cleaned and rebuilt as you may just have a dirty carburetor or bad diaphrams.Let me know what you find.Please give me a good rating as this is the only way that this site pays me for my time.
Customer: replied 1 year ago.
Hi
Thanks for that, the exhaust is clear, exhaust port clean, piston looks fine.
Could it be the coil breaking down, I.e.once it gets hot. Noticed as I worked on it today that the length of time from running normally to starting to bog down on higher throttle opening reduced significantly
Expert:  ranwell1 replied 1 year ago.

It is possible that the coil is breaking down, but usually when a coil breaks down, it stops producing spark altogether and the engine just shuts off all at once. If the piston and exhaust is ok, then your most likely issue could be the carburetor that is not getting enough gas. It may need to be cleaned and rebuilt. But at this point, we are just guessing what could be wrong, but my best guess is the carburetor not getting enough gas in high throttle or the carburetor is getting too warm and having a VAPOR LOCK. Try using Premium gas and you may find out that that is a big help. All 2 cycle engine should use only 92 octane or higher fuel. let me know what you find out. Please don't forget to give me a good rating for my effort. This is the only way that this site pays me for my time. Feel free to continue contacting me if you need more information.

What Customers are Saying:

 
 
 
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy
< Previous | Next >
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C.
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C.
 
 
 

Meet The Experts:

 
 
 
  • Jon K.

    Jon K.

    Small engine diagnostic expert

    Satisfied Customers:

    2823
    Gold certified Stihl tech, Service Manager for a rental/repair shop.Certified in most small engines
< Last | Next >
  • http://ww2.justanswer.com/uploads/jonrk/2010-1-5_22551_jon.jpg Jon K.'s Avatar

    Jon K.

    Small engine diagnostic expert

    Satisfied Customers:

    2823
    Gold certified Stihl tech, Service Manager for a rental/repair shop.Certified in most small engines
  • http://ww2.justanswer.com/uploads/KO/koboma/2012-6-6_20917_DSCF1022.64x64.JPG Curtis B.'s Avatar

    Curtis B.

    Technician

    Satisfied Customers:

    162
    Service manager and technician for all brands of engines with 40 + years of experience.
  • http://ww2.justanswer.com/uploads/HA/HankF/2013-8-27_12514_JAProfilepic.64x64.JPG Hank F.'s Avatar

    Hank F.

    Technician

    Satisfied Customers:

    5359
    Certified on Onan and Generac generators.
  • http://ww2.justanswer.com/uploads/RA/ranwell1/2013-5-23_17421_2fixed3.5x5.64x64.jpg ranwell1's Avatar

    ranwell1

    Small Engine Technician

    Satisfied Customers:

    5039
    Owner of Large Small engine repair business. Over 39 years. Certified both 2-cycle and 4-cycle engines
  • http://ww2.justanswer.com/uploads/SP/spankyjr1/2014-1-16_16395_Leha002.64x64.jpg spankyjr1's Avatar

    spankyjr1

    Small Engine Technician

    Satisfied Customers:

    19
    Journeyman TechnicianWorked on small to large engines for 30 yearsGas,LP,Diesel
  • http://ww2.justanswer.com/uploads/PL/Plumberpro/2014-6-23_6520_image.64x64.jpg Plumberpro's Avatar

    Plumberpro

    Plumber

    Satisfied Customers:

    40
    Fully qualified plumbing , heating and gas engineer 20 years experience
 
 
 

Related Small Engine Questions