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More power from my weed wackers? #5080929
04/20/19 04:24 PM
04/20/19 04:24 PM
Joined: Jun 2003
Posts: 18,885
Deplorable in apple valley, ca
Chris142 Offline OP
Chris142  Offline OP

Joined: Jun 2003
Posts: 18,885
Deplorable in apple valley, ca
I have an echo srm225 weed wacker. This year's weeds are out of control due to last Winters rain. It's great on smaller weeds but has trouble with the bigger ones. It calls for 50:1 mix.

Is adding or subtracting oil an option? Would that give it a little more power? Plug gap?


02 Wrangler carlube 5w30
87 F250 traveler 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
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Re: More power from my weed wackers? [Re: Chris142] #5080944
04/20/19 04:41 PM
04/20/19 04:41 PM
Joined: Oct 2017
Posts: 988
Georgia
MParr Offline
MParr  Offline

Joined: Oct 2017
Posts: 988
Georgia
I have the same trimmer. Yes, it does well on grasses and small stemmed weeds. It has trouble with the bigger stuff. You may want to look at the blade attachment for it. Changing the plug or fuel mix isn’t going to help.

Last edited by MParr; 04/20/19 04:42 PM.

2019 VW Tiguan SE Now: Factory fill & OEM filter
2017 Ford Escape SE 2.0T Now: NAPA Synthetic 5W30 & NAPA Gold 1348
Re: More power from my weed wackers? [Re: Chris142] #5080977
04/20/19 05:18 PM
04/20/19 05:18 PM
Joined: Feb 2003
Posts: 8,291
Jupiter, Florida
Cujet Offline
Cujet  Offline

Joined: Feb 2003
Posts: 8,291
Jupiter, Florida
To your first question, in many engines, more oil = more power. At the very least, it will require carb adjustment. Our testing had 16 to 1 as the most practical mixture ratio for power. However, the difference was rather small.

Plug gap won't help

A different muffler with no restriction will help (hollow with larger outlet) . Some of the chainsaw mod guys also own echo equipment and modify them for more performance: https://www.arboristsite.com/commun...mods-srm-210sb-gt-2000-etc.189994/page-4

The bottom line is that it's a 21cc engine and will not make a lot of low and mid range torque, regardless of mods.
It can, however, be modified to double it's original high end output without too much difficulty. That will require a bigger carb, a free flow exhaust and slightly more exhaust port timing and width.


People who count on their fingers should maintain a discreet silence.
Re: More power from my weed wackers? [Re: Chris142] #5080984
04/20/19 05:22 PM
04/20/19 05:22 PM
Joined: Oct 2014
Posts: 13,750
Canyon County Idaho
CT8 Online content
CT8  Online Content

Joined: Oct 2014
Posts: 13,750
Canyon County Idaho
A higher hp weed wacker . I run 32 to1 in mine and notice more power, especially when run hard for a long time.


2015 F150 2.7
2018 F350 6.2
Re: More power from my weed wackers? [Re: Chris142] #5080999
04/20/19 05:38 PM
04/20/19 05:38 PM
Joined: Jul 2016
Posts: 1,893
Jacksonville, FL
FlyNavyP3 Offline
FlyNavyP3  Offline

Joined: Jul 2016
Posts: 1,893
Jacksonville, FL
I have an OLD Echo SRM-2501 that's a few CCs bigger than yours. Bought it from a neighbor in 1995 hard starting because his kid had injured it on straight gas. New piston, rings, gaskets, removed spark arrestor, gutted baffles from muffler. 24 years later it still SCREAMS. It has a ton of power.

I'd start with opening muffler, gutting it, and adjusting the carb accordingly.

I run mine on Klotz Super Techiniplate somewhere between 40 and 50 to 1

Picture of the old trimmer for fun.

[Linked Image]


Luke
P-3C and P-8A Maritime Weapons and Tactics Instructor, Instructor Tactical Coordinator and Mission Commander
Re: More power from my weed wackers? [Re: Chris142] #5081002
04/20/19 05:42 PM
04/20/19 05:42 PM
Joined: Dec 2016
Posts: 8,459
Waco, TX
Linctex Offline
Linctex  Offline

Joined: Dec 2016
Posts: 8,459
Waco, TX
Start with removing the spark arrestor screen


"The evidence demands a verdict".
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Re: More power from my weed wackers? [Re: Chris142] #5081009
04/20/19 05:51 PM
04/20/19 05:51 PM
Joined: Oct 2017
Posts: 988
Georgia
MParr Offline
MParr  Offline

Joined: Oct 2017
Posts: 988
Georgia


2019 VW Tiguan SE Now: Factory fill & OEM filter
2017 Ford Escape SE 2.0T Now: NAPA Synthetic 5W30 & NAPA Gold 1348
Re: More power from my weed wackers? [Re: Chris142] #5081024
04/20/19 06:06 PM
04/20/19 06:06 PM
Joined: May 2010
Posts: 10,093
out there
spasm3 Offline
spasm3  Offline

Joined: May 2010
Posts: 10,093
out there
You could try some .080 line vs .095. Should take less power, BUT you will eat up the line faster.

Last edited by spasm3; 04/20/19 06:07 PM.

13 elantra 75k 5w30 QSUD
03 chevy avalanche 80k synpwr 5w30
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Re: More power from my weed wackers? [Re: Chris142] #5081034
04/20/19 06:24 PM
04/20/19 06:24 PM
Joined: Mar 2004
Posts: 1,705
Flaherty, KY
92saturnsl2 Offline
92saturnsl2  Offline

Joined: Mar 2004
Posts: 1,705
Flaherty, KY
I bought a new head at Rural King for one of my trimmers that has three blades on it, looks like this:

https://www.homedepot.com/p/Rino-Tuff-Push-N-Load-3-Blade-Universal-Trimmer-Head-16234/100671846

That thing blew through knee high grass and thicker stuff like a hot knife through butter. Mine didn't look exactly like that, it had three orange blades but similar setup.

I bought a new SRM-225 a couple years ago and ended up returning it for the SRM-266. No power issues at all now.


1985 F-250HD 7.5L 4x4 135k- Castrol GTX 15w-40
04 Odyssey EX 190k Valv. Durablend 5w-30
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Re: More power from my weed wackers? [Re: Chris142] #5081036
04/20/19 06:26 PM
04/20/19 06:26 PM
Joined: Feb 2003
Posts: 8,291
Jupiter, Florida
Cujet Offline
Cujet  Offline

Joined: Feb 2003
Posts: 8,291
Jupiter, Florida
Many of the non adjustable carbs have a secretly hidden adjustment in the center of the barrel throttle. Pry or drill the cap and adjust.


People who count on their fingers should maintain a discreet silence.
Re: More power from my weed wackers? [Re: Chris142] #5081065
04/20/19 06:46 PM
04/20/19 06:46 PM
Joined: Dec 2002
Posts: 43,014
'Stralia
Shannow Offline
Shannow  Offline

Joined: Dec 2002
Posts: 43,014
'Stralia
Per Cujet, richer is typically more power.

I've got this book in hard cover
http://iheartstella.com/resources/manuals/tuning/Graham-Bell-Two-Stroke-Performance-Tuning.pdf

Go to page 166 and enjoy...

BTW, this saw was built from this book...


If it's the truth....it can handle the pressure !!!
Re: More power from my weed wackers? [Re: Chris142] #5081125
04/20/19 07:46 PM
04/20/19 07:46 PM
Joined: Dec 2018
Posts: 18
White pine tn
BigGee Offline
BigGee  Offline

Joined: Dec 2018
Posts: 18
White pine tn
Muffler mods and richen it will help.I have the same machine and did these early in its life and am pleased.Just below the primer bulb will be a plastic plug over the needle,pull it out and richen it up.About a quarter turn really made a difference on performance.

Re: More power from my weed wackers? [Re: Chris142] #5081449
04/21/19 07:48 AM
04/21/19 07:48 AM
Joined: Jun 2003
Posts: 18,885
Deplorable in apple valley, ca
Chris142 Offline OP
Chris142  Offline OP

Joined: Jun 2003
Posts: 18,885
Deplorable in apple valley, ca
I did not realize that it's only 21cc. Considering it's size it runs well.


02 Wrangler carlube 5w30
87 F250 traveler 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: More power from my weed wackers? [Re: 92saturnsl2] #5081513
04/21/19 09:19 AM
04/21/19 09:19 AM
Joined: Jan 2018
Posts: 372
South Carolina (SC)
RyanY Online content
RyanY  Online Content

Joined: Jan 2018
Posts: 372
South Carolina (SC)
Originally Posted by 92saturnsl2
I bought a new head at Rural King for one of my trimmers that has three blades on it, looks like this:

https://www.homedepot.com/p/Rino-Tuff-Push-N-Load-3-Blade-Universal-Trimmer-Head-16234/100671846

That thing blew through knee high grass and thicker stuff like a hot knife through butter. Mine didn't look exactly like that, it had three orange blades but similar setup.

I bought a new SRM-225 a couple years ago and ended up returning it for the SRM-266. No power issues at all now.


^This
I use this kit from HD on my Hitachi 22.5cc and no longer have problems in weeds or ivy; it even cuts through small sticks with no problem.


2007 Cadillac CTS 3.6L >121k miles (Magnatec 5W-30 + Fram Ultra; Maxlife ATF)

2012 Honda Odyssey EX-L >98k miles (Pennzoil Platinum 5W-20 + STP XL; Pennzoil Platinum LV ATF)
Re: More power from my weed wackers? [Re: Chris142] #5085765
04/25/19 09:57 AM
04/25/19 09:57 AM
Joined: Feb 2003
Posts: 8,291
Jupiter, Florida
Cujet Offline
Cujet  Offline

Joined: Feb 2003
Posts: 8,291
Jupiter, Florida
Just an FYI for those curious, 20cc radio control 2 stroke engines, in a mild state of tune, make 2.5 to 2.8 HP. That’s a good bit more than the Echo 21cc OPE engine. That’s accomplished via better exhaust and intake. And generally not through high performance port timing. These things have to idle very reliably.


People who count on their fingers should maintain a discreet silence.
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