Ryobi C4620 chainsaw idles too fast

check the high speed idle on the carb. if not that see if the starter trigger is stuck.

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.

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 ,

need to idle it down and adjust the carb

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

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

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.

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

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)

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.