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Iwant to increase the revs on my HUSQVARNA modle LC 48V it has no mixture screw or idle screw and it has no trottle controle ,you just start it and cut away. I am having trouble with it collecting the grass and Ithink the revs might be a bit too low

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  • 38 Answers

Look behine the air filter and u see a spring it goes from a station to arm bend the pieace thats fix and stretch the sping a little

Posted on Oct 13, 2013

  • Sean Bannon
    Sean Bannon Oct 13, 2013

    Thanks very much ,that done the job,only its now inclined to hunt a bit mostly when its cold,instead of a steady rev it revs up and down while cutting the grass thank you very much

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Posted on Jan 02, 2017

  • 59 Answers

SOURCE: idles low, power loss, not enough power to cut grass.

check the spring on the carb

Posted on Jun 23, 2009

Dolfoff
  • 148 Answers

SOURCE: Poulan 550 mower idle problme

Check air filter, replace if needed.
Check engine oil level and condition. Add/change as needed.
Check spark plug. Clean and re-gap if needed (.030 gap)
Drain the fuel and replace with fresh premium grade gasoline. If your local station has a notice on the pump regarding Ethanol content, drive to another station!

Most owner's manuals specify 89 octane or higher and most warranties become void if E85 fuel is used.

And finally, Oxygenated fuels are not your mower's best friend. :-)

Hope this helps.

Posted on Oct 05, 2009

SOURCE: I have a husqvarna ez4824 zero turn lawn mower.

either a weak seat switch or your electric clutch is going bad!

Posted on Jul 06, 2010

Testimonial: "Thank you very much for your input. You were right - it was the clutch."

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1 Answer

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Turn mixture screws completely in gently, then wind out 11/2 turns each. The saw will be able to start and run at this point. On idle wind Low clockwise till motor starts to die then anti-clockwise 3/4 turn.
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The jet screws are fuel not air screws, the more they are unscrewd the richer the mixture becomes, basic settings are one and a quarter on the L screw and one turn on the H screw, you will have to fine tune from there, idle speed should be around 3000rpm, and max speed should not exceed 13000rpm, this should be set with a suitable engine tacho, when fine tuning always start with the L screw first, start gently screwing it in, the revs will start to increase as it leans off, when it starts to die because its too lean, unscrew until the revs pick up again, as you keep unscrewing you will hear the revs start to drop because it is becoming richer, leave it there, now blip the throttle, it should pick up instantly, if not turn the screw out a further 1/8 of a turn, the H screw is like a govener the more you screw it in the faster it revs, so do not exceed the 13000 rpm or this is a good chance it could seize, before any adjustments the fuel filter in the tank should be clean or replaced, the air filter should be cleaned and fresh fuel should be used.

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1 Answer

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The carb has an L screw, an H screw and an idle screw, both screws are fuel, not air screws, the L screw will increase the fuel mixture from idle to half throttle, the H screw will increase the fuel mixture at full revs, this will also govern the maximum revs the saw will do, it is very important you do not exceed the manufacturers recommended max rpm, if the saw will not rev clean up throught the revs, increase the L screw bit at a time until it does.

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1 Answer

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1 Answer

Hi, i have a 1999 husqvarna 254xp... its abit hard to start and never idles more than 3secs.....from doing some looking into , i think maybe the L screw needs adj? if so could u explain in simple terms how...


In simple terms here we go, turn both L screw and H screw fully in until they stop ( clock wise ) now turn the L scew out one and a half turns out, and the H screw one and a quarter turns out, start the saw ans warm up the engine, allow the saw to idle, if need be turn the idle screw in to gain a slightly fast idle, start to turn the L screw in, the revs will start to increse as the mixture leans off, thet will reach a point where the engine then starts to die because it is too len, at this point unscrew the screw quarter turn, check the machine revs up clean, if there is a hesitation unscrew the jet a smaal bit at a time until it revs clean, now adjust the idle screw so the engine idles without the cutting chain rotating around the bar, the H screw should be about right however if it sounds too rich at full throttle srew the jet in a small amount until it sounds right, the maximum rpm should not exceed 13500, this should realy be check with a rev counter, if the engine revs too high there is a fear that it will over heat and seize.

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1 Answer

When i start the saw up it starts up but shuts off when you hit the gas and also when it starts up it just shuts off. I don't know how to adjust it to make it run so i am asking how to adjust it. I have...


The carb screws are fuel screws, not air screws, gently turn them both in ( clockwise ) onto there seats, now back off the L screw 1 1/2 turns, back the H screw off 1 turn, you will have to fine tune from there, start the saw, increase the idle screw so it will idle if needed, start by screwing the L screw in, the revs will start to increase due to the weakening mixture, it will eventually start to die as it is too weak, so at this point start unscrewing the screw 1/4 turn, rev the saw, it should pick up smoothly, if not increase the L screw another bit turn until it revs smoothly, now set the idle screw so it runs 3000 rpm approx, the H screw is the govenor, the more you screw it in the higher the revs, the max rpm should be set with a taco to 12500rpm, do not exceed this or it may seize, before any adjustment, replace the filter in the fuel tank, use fresh fuel, and clean the air filter.
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1 Answer

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1 Answer

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