Echo CS440 Muffler Mod

[MikeRC]

Thanks for the membership, brand new member. I recently got an Echo CS440, I am the (Insert number here) owner. Description on FBmarketplace stated "Runs poorly"
It would idle, but not rev up. Limiter caps were already removed, and both screws were WAY out. Pulled the carb, opened it up, (didn't have a kit & was impatient). Screen in bottom of carb body had what looked like a glob of jello in it. Cleaned it out with carb cleaner, blew it out with air, including the passages, & found the starting screw settings on this site. (Thanks again!) Got it running & pretty much dialed in, but here's the issue: If I open the throttle slowly, it will free rev to the moon. If I snap it open, it bogs down & quits. Now to the muffler mod question. One of the previous owners did a hack muffler mod, with two fairly large holes drilled in the side. Could this be causing the bog? I understand 2 stroke exhaust impulse theory & this is my next quest. Looking for something to plug the larger & uglier hole. considering a cut off fat sheet metal screw with some JB weld. Any & all suggestions appreciated. Mike

 

[mountainlake]

Sounds like your low circuit is lean, try opening it up 1/2 turn. If no help the carb is still clogged. Steve

 

[MikeRC]

Sounds like your low circuit is lean, try opening it up 1/2 turn. If no help the carb is still clogged. Steve

Thanks for the reply Steve. I blocked off one of the muffler mod holes, no joy. Tried messing with low adjustment some more, not much change. Yeah, i guess carb is still dirty. Will order a kit & an ultrasonic cleaner and try it again. Thanks again.

 

[MikeRC]

I've had this carb on, off, apart, cleaned, more than I care to admit. Still not good throttle response.
Any opinions / thoughts / experience with Hipa carbs? Direct on their website, replacement carb, fuel filter, air filter, gaskets, & a spark plug (which I won't use),
$6.98 Free shipping. I've got it, gonna install it later today, will report results. Thanks for any/all advice.
Mike

 

[MikeRC]

Installed Hipa carb, runs great, throttle response is where it should be. Not sure what was wrong with the old carb, but hey, for $6.98, couldn't really go wrong.

 

[scottr]

Hello MikeRC , I found a picture of a Echo CS-440 muffler on the internet . It shows a plate with two outlet louvers on the right side of the muffler . There looks to be a spark arrestor screen under that plate . Have you cleaned or inspected that spark arrestor screen ?
Scott

 

[MikeRC]

Screen is clean. Carb swap made all the difference. Guess something is/was wrong/ clogged with old carb. Thanks for the reply.

 

[Gord404]

I have seen that jelly in gas when I empty gas tanks to put new gas in- dont know what causes it but its there sometimes