Weedeater advise

Lamont in NC · Jul 3, 2019

First off this isn't my weedeater, I'm just seeking advise for my older neighbor w/o internet. All info here is according to what he's told me I haven't worked on it or even heard it myself. He's pretty good on this stuff as a former heavy truck mechanic.

His Echo SRM225 string trimmer bogs down when the throttle is wide open. He cleaned the spark arrestor which was completely plugged up but that didn't fix it fully. He then rebuilt the carb and still wasn't satisfied. He then replaced the carb with a new one I got from him off ebay. He's still not satisfied and is now thinking about having me order a new coil. He's also talking about getting a new weedeater.

He says it runs great at 1/2 throttle but bogs down at full throttle and he's never seen a coil cause this kind of problem but he can't help but wonder. I'm still wondering if something in the exhaust or muffler is plugged. While he's deciding on the next step I'm asking if anyone else has any advise I can pass on.

Any thoughts welcomed. Thanks.

Mike M · Jul 3, 2019

I'd take the muffler off to see if more is plugged up than just the spark arrester.

Mutt and Jeff · Jul 3, 2019

Filter in the tank on the end of the fuel pickup hose
a bent wire will fish it out. Replace and stuff it back in.

ss55 · Jul 3, 2019

Does it run better with a completely full tank of fuel? How old are the fuel lines? Fuel lines get old, crack inside the tank and suck in air making the fuel mixture too lean.

Janicholson · Jul 3, 2019

Too lean on the high speed circuit.. If you see it run, watch for less smoke at high RPM. Jim

Jeff NWOH · Jul 3, 2019

Pull the muffler and clean the exhaust port on the engine. I did lawn care for years and used to run the echos. Every so often, I'd have to pull the muffler and scrape the carbon out of the exhaust port. It was always very gradual, but eventually you would realize the trimmer only had about half the power it used to.

GreenAcre · Jul 3, 2019

My fuel line from the tank to the carb got soft and would collapse when warm and under throttle.

showcrop · Jul 3, 2019

When you have the muffler off check the piston ring grooves too.

Steve@Advance · Jul 3, 2019

If the spark screen was clogged, possible there is more carbon in the muffler and ports. Especially if he's running heavy on the oil.

Did he replace the fuel lines and filter?

Did he pry the caps off and try backing the high speed adjuster out?

UncleTom · Jul 3, 2019

On a lot of newer chain saws and weed eaters they have a retard and advance timing built in to the coil. I have seen the carburetor like bog symptoms turn out to be the advance part of the coil not working.I believd they have the module built the coil. Any thing above mid throttle and above is a bog or no spark condition. Acts so much like a lack of fuel. Replace the coil or determine if it is loosing spark in that RPM range with a spark tester light.

comfortking · Jul 3, 2019

Start it with the muffler off. I bet the muffler is plugged. We have had more than a dozen echo trimmers and never had coil issues. Have had several plug the ports and the muffler.

mjbrown · Jul 3, 2019

If none of these suggestions work I suggest a battery powered weedeater. I have a Kobalt 80v that works great. Other makers also make good ones.

T.R.K. · Jul 3, 2019

I am thinking that carburetor is adjustable. Have you tried backing out the high speed screw a bit, 1/8 or 1/4 turn? If you feather in the choke lever 1/3 or 1/2 way, does it rev on up? (Don't run it that way long, just for test.)

Russ from MN · Jul 3, 2019

I agree with t.r.k, try opening up the high speed jet. I assume he has already done that, so what next? I had an ice auger that acted real strange a couple of years ago, turned out to be a reed valve. We had a leaf blower a couple of years ago that got hard to start, turned out the jug was coming loose from the crankcase, scored the cylinder, I gave up on it, glad I didn't spend any money on it!!

jacksun65 · Jul 4, 2019

We have a local expert on Echo's. You need a tach to set the new carb up properly. He usually does it for a cold brew if he likes you LOL

Weedeater advise

Lamont in NC

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Mike M

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Mutt and Jeff

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ss55

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Janicholson

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Jeff NWOH

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GreenAcre

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showcrop

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Steve@Advance

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UncleTom

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comfortking

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mjbrown

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T.R.K.

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Russ from MN

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jacksun65

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