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Echo 4920 mods?

Clarkc9743

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I am the owner of a new echo 4920 or I will be Monday when it shows up in the mail. The bread and butter for everything I own is muffler mod timing advance and base gasket delete. Obviously this is a clam saw so no gasket delete. However I can find very little information about these and am curious how they respond to timing advance. I've seen the one joe ported but I don't believe he mentioned timing advance in it. I'm all for taking it apart and trying it. BUT I don't have it yet and if they don't like it I wouldn't even bother. I did notice that the pistons are around 50$ so I may try a welded popup later on down the road though. Any other tips or suggested mods would be appreciated.
 

huskihl

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I haven’t heard of anyone here monkeying with the 20 yet. Maybe @Red97 has dicked with them a little bit
 

Clarkc9743

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He posted the video of the ported one and had respectable gains. They haven't been out long but there literally is no other videos on YouTube I can find other than the 2 he has posted.
 

Ketchup

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I think it’s a 44mm bore so there may be a taller piston out there.

Being a clamshell kills a lot of interest in serious mods.
 

Clarkc9743

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I've got it just havnt got to try it yet been stuck at work but it is a 45mm bore 31.7 stroke according to the manual Wich is disappointing. I was hoping it was 44.7 and a ms261 piston would work or be similar. If I tear it down and want more compression I will have to do a welded popup
 

Ketchup

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45mm is husky 353…I think the pin is different though.
 

Clarkc9743

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Got some time today to play around. I genuinely hate the stock Oregon chain that came with it, semi chisel safety chain. It responded well to the muffler mod it didn't care about the timing. Maybe slightly better throttle response I will probably leave it alone for now. And see how it likes it after I tear it down to port. Needs a full chisel chain bad. Squish is around .045-50. definitely getting a welded pop up eventually.
 

Red97

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I didn't do a timing advance.

But some lower transfer work, and exhaust work really brought it to life. That was the only one I had seen/ported. Sold it off and have not heard from the customer. So I take it as no news is good news.
 

Clarkc9743

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I have done similar to what you did along with a small pop-up I just havnt got around to making a video comparison. I'm waiting on a coil from a 4510 they are the same basic saw just different motors and coils mainly. The 4510 has a higher limit and possibly may not be limited at all Ive been waiting on the coil to show up before continuing to test.
 
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