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Old 07-16-2011, 11:51 AM
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Greg78 Greg78 is offline
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Echo SRM-230 low power.

I have 2 Echo SRM-230 trimmers that are 3 years old. One runs perfect and has great power. The other one runs good and never hesitates or sputters but when WOT doesn't even come close to having the power of the other one, feels about half throttle.

I have just changed the plug, changed the air filter, changed the fuel filter and cleaned the carb and I still feel like it should rev higher.

It does fine on weekly maintenance accounts which is all we do, but when we pick up new customers that might be a couple of weeks overgrown it struggles.

Not sure what to check next?
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Old 07-16-2011, 12:26 PM
Scooterbum Scooterbum is offline
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Check the screen in the muffler and make sure it's not loaded up with carbon.
The carbs are not worth fixing if a cleaning doesn't work.Just replace and be done.
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Old 07-16-2011, 12:56 PM
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Greg78 Greg78 is offline
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Quote:
Originally Posted by Scooterbum View Post
Check the screen in the muffler and make sure it's not loaded up with carbon.
The carbs are not worth fixing if a cleaning doesn't work.Just replace and be done.
Forgot to mention, tossed screen as well.
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Old 07-16-2011, 04:16 PM
GlynnC GlynnC is offline
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Quote:
Originally Posted by Greg78 View Post
Forgot to mention, tossed screen as well.
Have you pulled the muffler and checked the exhaust port comming off the cylinder? Clogged exhaust ports will definetly cause loss of power--depending on how much carbon, engine will still run and appear to be okay, just doesn't develope power.
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Old 07-16-2011, 07:45 PM
mountainlake mountainlake is offline
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If the high is set a bit lean or rich it will cut the power a lot. Try adjusting it both ways . Steve
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Old 07-16-2011, 08:03 PM
PTP PTP is offline
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Quote:
Originally Posted by GlynnC View Post
Have you pulled the muffler and checked the exhaust port comming off the cylinder? Clogged exhaust ports will definetly cause loss of power--depending on how much carbon, engine will still run and appear to be okay, just doesn't develope power.
I am fairly sure that you will find the culprit there. I have cleaned mine out numerous times with good success. If that doesn't do it, then pull the spark plug and check for scoring on the piston. I am betting that it is a simply clogged exhaust port though.

Just scrape it off with a screwdriver, being careful not to touch/scratch the piston or the cylinder walls. Blow the debris out with some compressed air, reassemble, and you should be good to go.
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Old 07-16-2011, 09:56 PM
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Greg78 Greg78 is offline
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Thanks, I'll check the exhaust port tomorrow.
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Old 07-16-2011, 10:29 PM
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Merkava_4 Merkava_4 is online now
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You need to gain access to the throttle valve needle that's hidden by a plastic plug. The EPA
thinks that carburetors never need to have their mixture adjusted. I disagree very much so.
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Old 07-17-2011, 03:28 AM
topsites topsites is offline
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You might just have some slack in the throttle cable needs adjusting...

I would visually inspect the throttle cable mechanism where it hooks to the carburetor itself,
make sure when you pull the trigger, that it's opening up fully on the carburetor end.
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Old 07-17-2011, 10:29 AM
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Greg78 Greg78 is offline
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The exhaust port was pretty bad, after cleaning it out it revs like the other one now.
Thanks
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