Question about Ryobi DOUBLE D - CARB ADJUSTING TOOL 308535002 - for Homelite Craftsman Chainsaw Trimmer

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Ryobi C4620 chainsaw idles too fast

Intermittently, while using my Ryobi C4620 chainsaw, it will decide to idle at a very high speed, almost at normal cutting speed. Adjusting the idle-setting screw does not affect the problem, because the part that should be touching that screw is not even close to it. It appears that whatever spring or device is supposed to return the throttle valve to the idle position does not have enough force to overcome the associated friction. I've tried lubricating the moving parts of the throttle linkage, but to no avail. Is this perhaps a common problem with the C4620, -possibly a design problem? Thanks!!

Posted by Anonymous on

  • Curley Frazier
    Curley Frazier Apr 10, 2016

    I just sprayed the cable with throttle cable lubec& it went right back to idle.

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I had this same thing . Its in the throttle cable tube. take the cable away from the carb. cut about 1/4 in of the tube around the cable off reattach to carb it works for me!

Posted on Apr 10, 2015

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Cutting the cable shrowd is the only real fix. After break-in period I surmised the cable shrowd expands from heat & oil. 1\4" is too much. Remember you can't glue it back on. This is cheapo polymer shrowd with no inner wire shielding. The idle screw is not infinite, & actually very limited ie: if you cut too much off the idle screw will not increase rpm enough to idle.

Posted on Apr 22, 2016

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Posted on Jan 02, 2017

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SOURCE: idle is off??

hi leobowdy

disassembly the carb and carefully clean it.Check the air filter,the fuel line and fuel filter,check the needle,lever,small spring and the screen filter from the carb.Check the sparkplug.
high speed H=2 turns,low speed L=2 1/2 turns,adjust T
When chain saw starts adjust H,L and T accordingly.

cheers savumihai71.

Posted on Dec 03, 2008

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SOURCE: what are the LOW and HIGH speed screw settings

carburetor adjustment screws

Posted on Feb 22, 2010

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SOURCE: Chokes and Dies when cutting

Adjust the choke or carburetor. In case your chainsaw stalls when the engine is idling, ensure that the choke is set properly. To do so, first try releasing it to adjust it, and then move the plate and tighten all screws once again. To loosen any grit, spray carburetor cleaner spray on the choke's shaft. The carburetor may also need to be adjusted; consult your owner's manual which will guide you on resetting the idle mix screw.

Posted on Mar 13, 2014

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1 Answer

Chokes and Dies when cutting


Adjust the choke or carburetor. In case your chainsaw stalls when the engine is idling, ensure that the choke is set properly. To do so, first try releasing it to adjust it, and then move the plate and tighten all screws once again. To loosen any grit, spray carburetor cleaner spray on the choke's shaft. The carburetor may also need to be adjusted; consult your owner's manual which will guide you on resetting the idle mix screw.

Mar 13, 2014 | Ryobi 940968018 C4620 Label

1 Answer

Ryobi chain saw has no power


saws that seem to have no power but do accelerate to full speed (screaming) most times is either a compression issue or a clutch slipping (clutch will get very hot in use if this is case) compression issues are most allways a total rebuild on the piston and cylinder ,

Jan 01, 2014 | Ryobi 940968018 C4620 Label

1 Answer

What are the carb settings for ryobi rct 2800 cb trimmer ,they have been adjusted so the correct position of the screws is not known


Hi peter beaufoy...
Before you remove or try to adjust your low and high speed jets you should always count the number of turns it takes to lightly seat the idle mixture screw and high speed needle adjusting screws.
Be sure to write the number of turns down on a piece of paper so you will know how many turns from the seated position to open the jets when you go to reinstall them, or if you remove them for cleaning or replacement.
If you have aready tried to adjust them then the adjustments below should get it running for you for final adjustment when warm.
Normally you will adjust your idle jet to 1/2-3/4 turn open from the bottom seated position.
Then you will re-adjust the low speed of the engine when the engine is warm by turning the idle screw in or out till the engine runs smoothly at idle speed, around 1200 RPM.
The high speed jet is adjusted to 1 1/2- 1 3/4 open from the bottom seated position, after the engine is warm.
Then re-adjusted by turning the High Speed jet adjustment screw in or out till the motor runs smoothly at high speed.
Alway use the "lightly seated" method if you have not changed the screw settings.
Please take time to rate me
Bud

Sep 20, 2012 | Ryobi Garden

1 Answer

How do I adjust the mixture screws on the top of the Ryobi 700r carburator


Hi trr6...

Before you remove or try to adjust your low and high speed jets you should always count the number of turns it takes to lightly seat the idle mixture screw and high speed needle adjusting screws.
Be sure to write the number of turns down on a piece of paper so you will know how many turns from the seated position to open the jets when you go to reinstall them, or if you remove them for cleaning or replacement.
If you have aready tried to adjust them then the adjustments below should get it running for you for final adjustment when warm.
Normally you will adjust your idle jet to 1/2-3/4 turn open from the bottom seated position.
Then you will re-adjust the low speed of the engine when the engine is warm by turning the idle screw in or out till the engine runs smoothly at idle speed, around 1200 RPM.
The high speed jet is adjusted to 1 1/2- 1 3/4 open from the bottom seated position, after the engine is warm.
Then re-adjusted by turning the High Speed jet adjustment screw in or out till the motor runs smoothly at high speed.
Alway use the "lightly seated" method if you have not changed the screw settings.
Please take time to rate me

Sep 22, 2011 | Ryobi Garden

1 Answer

My Ryobi cs30 weed eater tends to shut off after I release the throttle.


Find the idle speed screw (not the jet screw) and turn it CW until the engine idles without dying. If too high, the string head will turn all the time. Hope this helps

Sep 06, 2010 | Ryobi Garden

2 Answers

When idling chain keeps turning


if this is happening, then your chainsaw is just idling to fast, you need to turn down the idle speed a little. on the carby, there are 3 screws, 2 small (H), (L), and a larger screw is the idle speed one, turn anti - clockwise to reduce idle speed.
Hope this helps.

Jun 13, 2010 | Stihl 16" Chainsaw Bar Chain Saw 018 025...

1 Answer

LOW and HIGH speed screw settings


you those to adjust the carb hi is balls out running , sometimes it sounds sick or spudders when cutting the hi will clean that up small turns only . low is for idle. ok

Feb 22, 2010 | Garden

1 Answer

Poulan chainsaw 46cc 20" chain


You normally have 3 screws - idle speed - slow running and fast running.
First take care as if it runs faster than idle speed that chain will be whipping around also.

Second you have to determine what is the problem. Is it faulty at low speeds or high speeds ? or won't it idle.
If it has turn stops fitted to the screws you only have a small adjustments either way.

If it won't idle, try turning in the idle screw a half turn - until the chain just starts to move slowly.
If its dying at slow speeds, get is going and slow turn the slow screw out until it starts to run a bit rough then turn it back in to the point where its running smoothly.

Bad fast speed can be caused by simple things such as a blocked muffler ( insects too - I had one blocked off by a mudnest wasp) - otherwise get it running at full and adjust the fast screw as per the slow one - out till its rough then back in slowly until its smooth.

Suggest before all this tho that you get it running with the cover off the carby and then give it a good squirt of carby cleaner first - it may just clear out any 'poop' thats there.

(Have faith even tho I have a Poulan with a carb that refuses to run on anything but carby cleaner. I have pulled it apart a few times and renewed all the perishable bits buts its a real pig)




Feb 28, 2009 | Poulan Pro Chain Saw 46cc 20"

1 Answer

Idle is off??


hi leobowdy

disassembly the carb and carefully clean it.Check the air filter,the fuel line and fuel filter,check the needle,lever,small spring and the screen filter from the carb.Check the sparkplug.
high speed H=2 turns,low speed L=2 1/2 turns,adjust T
When chain saw starts adjust H,L and T accordingly.

cheers savumihai71.

Nov 22, 2008 | Ryobi Factory Reconditioned 18" 40cc...

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