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  1. #1
    Bronze Member
    Join Date
    Oct 2006
    Posts
    65
    Location
    Jefferson, GA
    Tractor
    JD 4320, NH TC29D

    Default 2 Cycle Will Not Rev Up

    I have a Stihl model HS 80 hedge trimmer that will not rev up. The last time I used it about a month ago it ran fine. It cranks very easy, but when I pull the throttle it dies before it even gets up to 1/3 speed. I have changed the plug, cleaned the air filter and changed the fuel pick-up filter. It has new fuel in it. Since it ran fine the last time I used it I have not messed with the carberator adjustments. Any suggestions?

  2. #2
    Elite Member Dmace's Avatar
    Join Date
    Oct 2005
    Posts
    3,838
    Location
    Wakefield, NH
    Tractor
    Kioti CK20 HST

    Default Re: 2 Cycle Will Not Rev Up

    Have you taken the carb apart and cleaned the jets?
    Derek
    Kioti CK20HST
    KL120 FEL // KB2365 BH // 60" JRW 3ph snowblower // 48" HD Boxblade
    Sims-Cab Depot heated cab
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    Now it's time for Ford and GM to step up

  3. #3
    Gold Member Shmudda's Avatar
    Join Date
    Jan 2008
    Posts
    299
    Location
    Western Pennsylvania
    Tractor
    Kubota BX24

    Default Re: 2 Cycle Will Not Rev Up

    Also make sure the spark arrestor on the exhaust isnt plugged up with black soot and carbon. Some manufactures put small screens on their mufflers that gum up and make the unit do that....

    Craig
    Honda is truly the best on earth, but Kubota is coming a close second!
    Remember - you get the government you deserve and voted for!!
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  4. #4
    Veteran Member Iron Horse's Avatar
    Join Date
    Feb 2008
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    1,804
    Location
    Orstraya , Ex convict stock , G'day .

    Default Re: 2 Cycle Will Not Rev Up

    Along the same lines as Shmudda , check the exhaust for Mud Wasp nests . They just love 2 stroke mufflers .

  5. #5
    Epic Contributor Bird's Avatar
    Join Date
    Mar 2000
    Posts
    37,761
    Location
    Texas

    Default Re: 2 Cycle Will Not Rev Up

    So far, every time I've had that kind of problem with a 2 cycle engine, it's either been the exhaust plugged up, as already mentioned, or a simple carb adjustment. I've been lucky enough to not even have to take a carb apart.
    Bird

  6. #6
    Silver Member
    Join Date
    Aug 2009
    Posts
    161
    Location
    Central Arkansas
    Tractor
    Cub Cadet 1811 \and a cub cadet 149

    Default Re: 2 Cycle Will Not Rev Up

    i have to agree with the carb cleaning and or adjustment, and the plugged exhaust.............good luck.....Don

  7. #7
    Silver Member
    Join Date
    Feb 2006
    Posts
    242
    Location
    Stonington CT
    Tractor
    Kubota L-45

    Default Re: 2 Cycle Will Not Rev Up

    I would clean the carb, just went trough this with a blower. Darn ethanol.

  8. #8
    Bronze Member
    Join Date
    Oct 2006
    Posts
    65
    Location
    Jefferson, GA
    Tractor
    JD 4320, NH TC29D

    Default Re: 2 Cycle Will Not Rev Up

    Thanks for the advice. When cleaning the carb does it require taking it off or is there something that can be sprayed in it to do the job? I removed the spark arrestor and cleaned it. It was not very gummed up at all. It did not help the situation. It still will not rev up and stay running. The engine idles perfectly however. Now I'll out of town on business all week. I'll get back on it this weekend.

  9. #9
    Elite Member ToadHill's Avatar
    Join Date
    Oct 2005
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    2,711
    Location
    Catt county New York
    Tractor
    Kioti DK35, Ford 8N, Oliver Cletrac

    Default Re: 2 Cycle Will Not Rev Up

    I had a similar problem with a Stihl chainsaw. I found the problem was the fuel line ahd gone bad due to ethanol just ate the rubber. One juel lint about 5 inches long $14.
    I can't control my day but I can control my attitude.

  10. #10
    Epic Contributor
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    jinman's Avatar
    Join Date
    Feb 2001
    Posts
    21,014
    Location
    Texas - Wise County - Sunset
    Tractor
    NHTC45D, NH LB75B, Ford Jubilee

    Default Re: 2 Cycle Will Not Rev Up

    Quote Originally Posted by ToadHill View Post
    I had a similar problem with a Stihl chainsaw. I found the problem was the fuel line ahd gone bad due to ethanol just ate the rubber. One juel lint about 5 inches long $14.
    That's what I thought until I reread his first post where he said he had changed the fuel filter. If he did that and the pickup hose was deteriorated, surely he would have noticed. So I'm no longer thinking that could be the problem.

    If your Stihl engine is like my chainsaw, there are two adjustments. One is just the idle speed adjustment. The other is the fuel adjustment. To set it properly, carefully rotate it clockwise to the the stop and then rotate exactly one turn CCW. Start the engine and adjust more CCW until the engine responds well with no stalling. Make very small adjustments. It doesn't take much to make a big difference with this screw. If it is adjusted properly, the engine will accelerate very well and have plenty of power to boot.
    Jim


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