Mastermind Meets The Echo CST-610EVL

[Mastermind]

That's right ladies and gentlemen.....we have a sweet looking Echo CST-610EVL twin cylinder chainsaw here to work on. The owner thought this would be a fun project and I agree completely.

Even though this is a twin cylinder saw it's displacement is only 61cc (3.72 cu. in.). It uses horizontally-opposed simultaneous firing with cylinders in the front and rear. Bore is 38mm and stroke is 30mm.

I made two cuts with the saw and felt it was way underpowered. I suspected internal problems so I didn't run it enough to take any before video.

Here's some pictures as I was tearing it down.

The air filter has flocking on the top but is mesh on the bottom. I can't see it being a restriction.

The carburetor is a Walbro HDA.

This plug pops out to access the front spark plug.

The rear plug is in the "normal" location.

 

[Eccentric]

Subscribed. Got my bacon flavored popcorn.opcorn:

 

[old 040]

i really want to see how this turns out, i had one of these, but sold it mainly because of it being underpowered for it's size and for being a twin, thought it would run better than it did, oh well

 

[Ironhand]

opcorn:

 

[7sleeper]

opcorn:

I really enjoy your threads!

Thanks,

7

 

[Mastermind]

Under the recoil.....boxer style.

Looks like a well thought out air shroud setup....air forced past the cylinder fins exits here. There's a grill cast into this area of the front cover.

Looks like we will be needing av parts.....

 

[Mastermind]

The "jumbo" muffler.

And this is where sadness struck......

 

[stihlavarna]

opcorn:

 

[Eccentric]

Well crap...:msp_confused:

 

[Mastermind]

Here's a few more pics.....

I sent the owner a PM.....so we are waiting the see where we go next. I've found the piston kits for 70.00 a pop. The jugs will clean up easily. I'm thinking new seals, gaskets, and pistons.....

 

[barneyrb]

Take your caliper and measure that piston, the math don't add up at 38mm bore..........

 

[Mastermind]

Well crap...:msp_confused:

You didn't see that coming did you????

I didn't either. I figured it needed rings at worst. It started easily and ran well......not much power but smooth and clean.

 

[Mastermind]

Take your caliper and measure that piston, the math don't add up at 38mm bore..........

I'll do that. I was basing that from info found on the internets.......we all know they are never wrong though.

 

[Trx250r180]

thats a different looking powerhead for sure ,hows parts availibilty ?

 

[ozflea]

Yes thev twin was always underpowered a real dissappointment pity they had the capacity so small now 120cc might have been a different story

McBob.

or cdi my twin has a crook ignition on one end and i was hoping a module might help get it running ?

 

[Mastermind]

thats a different looking powerhead for sure ,hows parts availibilty ?

I've found the pistons already. On the prowl for av bushings......now.

 

[morewood]

Subscribed. Got my bacon flavored popcorn.opcorn:

I want some.....gotta love bacon!!!

Did you really have to ask the owner, BUILD IT! Show Bradley it can be done.:msp_tongue:

Almost have a pile of saws ready to send you

Shea

 

[Mastermind]

I want some.....gotta love bacon!!!

Did you really have to ask the owner, BUILD IT! Show Bradley it can be done.:msp_tongue:

Almost have a pile of saws ready to send you

Shea

I always give the owner a heads up........I would want one too. I'm sure he'll want to go for it.....

Send em.

 

[o8f150]

good job randy,,, this will be an interesting build,, i never seen the inside of one of those personally

 

[bryanr2]

So are Pm's not working cause over the last week I have sent several different members pms and havent gotten a single response from any of them. And I am sure they are not avoiding me bc the pms are regarding their financial gain/ my loss. :msp_razz: Just trying to figure it out. Anyone else having trouble pm'n? :msp_confused:

Im signing off, I'll check back in tomorrow night.