Echo 590 carb

[dahmer]

Picked up up another 590 from a guy moving to a condo. All he ever ran in it was Echo Red Armor premix and he gave me the gallon can that was still half full so I kinda eliminated bad full. Took it out today to cut and it seemed really rich. Kept turning the H until it sounded descent, my hearing does suck, but the H was seated. Checked it tonight with the tach and with the H seated it’s at 12,100. I’ll have to put it in wood again to see how it cuts but seems weird that 12,100 is WOT with no load. Any insights? Yes the limiters are removed.

 

[Stevetheboatguy]

@Red97

Hey Joe. What is the coil limited to on these?



Steven

 

[huskihl]

I think the 590 and 620 are known for having too large of a main jet in the carburetor and don’t like to lean out enough

 

[farminkarman]

I think the 590 and 620 are known for having too large of a main jet in the carburetor and don’t like to lean out enough

Kev, this is for sure the case on the 590. Is the 620 in the same boat?

 

[Mastermind]

Gotta do some tweaks to the carb.

 

[huskihl]

Kev, this is for sure the case on the 590. Is the 620 in the same boat?

I’ve only been into a couple 620’s and didn’t notice the problem. I just figured they were the same

 

[Ronie]

Picked up up another 590 from a guy moving to a condo. All he ever ran in it was Echo Red Armor premix and he gave me the gallon can that was still half full so I kinda eliminated bad full. Took it out today to cut and it seemed really rich. Kept turning the H until it sounded descent, my hearing does suck, but the H was seated. Checked it tonight with the tach and with the H seated it’s at 12,100. I’ll have to put it in wood again to see how it cuts but seems weird that 12,100 is WOT with no load. Any insights? Yes the limiters are removed.

You could try replacing the jet with one like out of a 199 or just cover the hole in the top of the jet with JB Weld to make it fully adjustable, both ways work.

JB Weld


199 jet

 

[farminkarman]

You could try replacing the jet with one like out of a 199 or just cover the hole in the top of the jet with JB Weld to make it fully adjustable, both ways work.

JB Weld
View attachment 334369

199 jet

View attachment 334370

Yeah, what he said!

 

[Mac25]

is there a special tool to remove the orig nozzle assembly ?

 

[huskihl]

is there a special tool to remove the orig nozzle assembly ?

Just a punch slightly smaller than the jet. And drive it into the Venturi

 

[drf256]

Like they say above, the main nozzle has a bleed hole in it on the echo 590/600/620 carb that won’t allow it to be leaned out enough. Need to change the nozzle or close that hole shut.

It’s not the jet, it’s the base of the nozzle.

 

[Red97]

@Red97

Hey Joe. What is the coil limited to on these?



Steven

It has been a while but I want to say around 13.5k on the 590

 

[Mac25]

well i ordered the venturi and installed it, not particularly fond of the jb weld in a fuel system, got it
tuned up and it cuts well, before the change it seemed to use more fuel than i expected, thanks to all.

the chain oiler was set excessive so am turning it down slowly and watching.