Echo cs-2511t issue

southsoundtree · Apr 26, 2023

My couple year old cs2511t is set with H and L jets fully open. It runs rich, fouling the plug. Clean air filter.

Is this needing a carb rebuild, possibly?

I've been trying to get it hot, rather than only short run times, only.

I've had exhaust clogging issues in the past with my Stihl top handles fro. The very frequent on/ off cycles.

Jackjcc · Apr 26, 2023

If it’s running rich then you want to turn the needles in to reduce the fuel flow. When you say you have it fully open I’m reading that as the screws backed out all the way to the stop. That’s going to give you too much fuel and will foul the plug due to inefficient combustion.

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Shadowscape · Apr 26, 2023

The L jet is set first, and it is adjusted for best throttle response.
The H jet is only used to set the MAX RPM, and it should be adjusted to 12,700 after the L jet has been set properly.
The idle screw is then adjusted for a idle RPM of 3,200.
Clutch should engage about 4,300 RPM.

evo · Apr 27, 2023

Mine gums up the muffler screen like a mofo

Muggs · Apr 27, 2023

Shadowscape said:
The L jet is set first, and it is adjusted for best throttle response.

Dave can you explain what you mean about adjusting the L jet specifically. I'm helping my friend with his cs2511. I started by removing the spark arrestor which immediately helped a lot, but it's still going to have combustion issues that need to be fixed. When you say best throttle response, is that just a personal preference or is there a spec?

Shadowscape · Apr 27, 2023

Typically, when you turn the L jet in and out you will find that spot where the saw runs the fastest while idling. That is not it, but it is a good place to start. Usually a slight turn in from there will give you the best throttle response. By that I mean, the saw rips as soon as you squeeze the throttle. If it hesitates slightly, you need to tweak (tweak= 1/16th turn) the L jet until it reacts as quickly as possible when you squeeze the throttle. That is what the LOW JET adjustment is for, setting the throttle response. That happens to be the best setting to make the saw run as it should fuel/air wise as well.
Then the HIGH JET is only for setting the max RPM while the throttle is fully squeezed. You can over rev the saw with that jet screw, so don't automatically turn it to the highest rpm it will go. You will burn it up. Use a tach., unless you have a great sense of how it should sound at max RPM.
ps: And those numbers I mentioned above are for the 2511, not all saws.

southsoundtree · Apr 27, 2023

Thanks.

I just started looking at it.

It is surprising that the adjustments were all the way out.
I don't know where they have been set for the life of the saw. It had been fine as it was for years until the recent past.

I was confusing out being leaner, not richer. Silly mistake.

I have a tachometer, somewhere nearby, having just come across it after a long time without it.

My working elevation is all the same, and temperature range varies about 50 degrees. Pressure and humidity change seasonally, somewhat.

I've been hesitant to mess with the jets, wanting to avoid a lean issue/ seizure.

It's sat for a while, as I have another 2511t and 2500t, along with a 200t and 193t.

When I get a minute, I'll mess with it.

Shadowscape · Apr 27, 2023

southsoundtree said:
Thanks.

I just started looking at it.

It is surprising that the adjustments were all the way out.
I don't know where they have been set for the life of the saw. It had been fine as it was for years until the recent past.

I was confusing out being leaner, not richer. Silly mistake.

I have a tachometer, somewhere nearby, having just come across it after a long time without it.

My working elevation is all the same, and temperature range varies about 50 degrees. Pressure and humidity change seasonally, somewhat.

I've been hesitant to mess with the jets, wanting to avoid a lean issue/ seizure.

It's sat for a while, as I have another 2511t and 2500t, along with a 200t and 193t.

When I get a minute, I'll mess with it.

Sean,
If you bought the saw new it probably still has limiters on the jet adjustments that keep you from making adjustments that will damage the saw. They only allow you to turn the jets adjusters so far in each direction.
Those limiters can be removed, but if you need to go beyond what they allow, you probably have some other issue that needs to be addressed. Also, most of the time when the limiters are removed it also removes the screw you normally use to adjust them, and then you need a special carb tool. Those can be bought on Amazon, and are relatively cheap, but like I said, if they need to be removed to adjust the jets to make the saw run correctly, you have other issues such as dirty air filter, dirty fuel filter, fouled plug, air leak at carb/block mounting, etc.

Bart_ · May 9, 2023

Does the cs2511t have an accelerator pump in its carb? The off idle response with a pump carb is way better. You can experience no pump performance by having a failed accelerator pump in a 200T. My pump failed again and I just adjust my throttle technique to "not sudden way open" like you can do with a working accel pump. Just to consider when figuring off idle performance. Best in your endeavour.