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Echo trimmer


timd's Avatar
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10-21-04, 09:55 PM   #1  
timd
Echo trimmer

Echo brand; SRM-2100SB grass trimmer starts easily and idles fine but won't rev up. Instead, it bogs down but stays running. If I bring speed up slowly (very slowly) it tends to speed up but not to high enough rpm's as it used to. Have replaced fuel filter, spark plug...no help. Have a leaf blower with same engine (22 cc) that runs fine and use same gas in both, so that's not the problem. Hey,........just thought about the fuel line. Could it be collapsing when I try to rev it up? Trimmer is 3 years old.

 
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10-21-04, 11:05 PM   #2  
sceptre
Timd,

remove the plastic cap(s) from H and L screws, then turn the H screw
clockwise 1/8 turn or so, while the throttle is reved wide open. turn in or out til motor is at it's highest rpm but will still sputter just a little. see if this helps

 
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10-22-04, 02:54 AM   #3  
joebj
remove muffler and make sure port is open.

 
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10-22-04, 05:14 AM   #4  
timd
I forgot to mention that I did check the muffler port.
Thanks for the reply tho!

 
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10-22-04, 05:24 AM   #5  
timd
sceptre, thanks for the reply. I considered popping the caps but really couldn't justify it since it used to run great. Maybe the H jet is clogged and needs cleaning. I'll give your suggestion a try. Thanks again.
Also, I noticed the priming bulb is only half full of fuel when running. Is this OK (normal)?


Last edited by timd; 10-22-04 at 05:27 AM. Reason: addition
 
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10-22-04, 10:02 AM   #6  
Azis
When you checked the muffler port did you check and clean the "Spark Arrestor"? Should be a screen that can be removed and cleaned. This is pretty common problem and exhibits the symptoms you mention.
The caps should allow for some adjustment, try adjusting with the caps on first. Personally I would start with the L,(also a lot of H jets are factory set and non-adjustable). Adjust it CCW in small increments until you can go from idle to full throttle without hesitation. If you get it to do that and the high RPM's are still not quite there and your H is adjustable, with the unit at full throttle, adjust the H CCW until is seems as tho it will fly apart then adjust CW 1/8 to 1/4 turn If the adjustments have little or no affect try it with the air cleaner removed. If still no help you may need to service the carb.

 
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10-22-04, 04:46 PM   #7  
timd
Update

I got some carb cleaner; popped the caps on the H & L needles, determined their positions and removed them; took carb off and sprayed carb cleaner in every orifice. Wiped it all dry and reassembled. Replaced H & L needles to proper position. Installed new spark plug gapped to 0.25". Installed brand new air filter and filled with new gas mixture. Gave it a couple of tugs and it sputtered a little and then died. Adj the L needle and pulled again and it came to life. Fine tuned the L needle and got it going smooth. Let it run at idle for about 4-5 minutes. Then I rev'd it up and it rev'd up pretty good. I adj the H needle and it ran great. Was able to trim 2 lawns. Shut it off to finish that yard and then walked across the street to start trimming another yard. Cranked up OK but it bogged down again. Managed to nurse it thru that yard but it was running terribly. Took it to my garage and pulled the air filter cover off and found bottom half of it was saturated with gas/oil mixture. Cranked it up and I could feel air coming from the carb throat.


Last edited by timd; 10-23-04 at 10:01 AM. Reason: typo
 
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10-22-04, 06:45 PM   #8  
Azis
Did you find and check or clean your spark arrestor!?!? Not just the muffler port. This is most likely the cause. Excessive back pressure from the exhaust causing it to escape out the carb.
The diaphram kit should be available at any Echo dealer. Its prolly a Zama maybe a Walbro carb but made just for Echo and your application. So a Echo dealer is your best bet.
Check the web site for a local dealer
http://www.echo-usa.com/scripts/mqin....exe?link=find

 
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10-22-04, 08:06 PM   #9  
timd
Some months ago, I tried to purchase an arrestor screen cause the old one was cruded up. The Echo parts man/service tech said it wasn't really necessary to have so I left it out.

 
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10-23-04, 12:40 AM   #10  
Sure sounds like a clogged exhaust to me too. Try it without the muffler and see if it responds well.


"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

God bless!

 
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10-23-04, 08:16 AM   #11  
timd
Fixed!!!

Thanks to all, especially joebj (He was the first to mention removing the MUFFLER). I had previously removed only the 'muffler lid' and 'exhaust guide' as they are called in the parts breakout I found online (where the spark arrestor screen bolts onto the muffler). This morning, after a good night's sleep, I attacked the problem with a clear (and open) mind. Reread all the posts y'all left, took the muffler off and the cause was obvious. Where the exhaust port on the cylinder was suppsosed to be about 3/4" X 1/4", there was only a small hole about 1/4" round. I scratched all the crud out and flushed it out with fuel. Reassembled and it's running fine.......even better than yesterday when I thought I had it fixed! Thanks again, folks! I really appreciate the responses. (don't y'all have anything better to do than read forums?) Hope I can help someone on one these forums someday. Thanks again!!


Last edited by timd; 10-23-04 at 10:05 AM.
 
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10-23-04, 09:25 AM   #12  
Azis
Well glad you got it.
As far as having something better to do...heheheh this forum helps me do things better kinda my training, I read and post as much to learn as I do to help.

 
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07-16-11, 06:37 PM   #13  
Thanks! for this thread

I have an echo trimmer srm 2100 and found this thread regarding a trimmer bogging down and not achieving maximum speed...bogging down. I followed other advice to check the breathing tube and gas lines. I did use sea foam thru the carb also. None of this worked. I ignored the advice concerning spark plug replacement or intensive carb cleaning. BUT I DID CHECK THE SPARK ARRESRTOR/MUFFLER SCREEN AND IT WAS TOTALLY BLOCKED WITH CARBON. I took off the screen and much to my happiness it started and revved to max engine speed. Awesome! I saved myself buying a new trimmer. thanks for the posting and advice. My muffler screen is soaking in gas and will clean it with a wire brush. MUCH THANKS!

 
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