Cs590 problem

[Jwilliams]

Alright guys so I have a cs590 muffler mod, base gasket delete and .020 off the keyway for flywheel and it seemed to be running great for a bit. But now it seems to be lacking even with h screw all the way in can’t seem to get max rpm out of saw seems to be dogging in the top end Any input would help. Thanks John

 

[Kel71]

Pull the muffler. How's the piston look?

 

[Jwilliams]

Piston looked like it was new.

 

[ammoaddict]

You probably need to put the timing closer back to where it was. Most echos are advanced enough from the factory. That's what most folks say anyway. I have no personal experience with advancing an echo only a Stihl and a few Husqvarnas.

 

[Jwilliams]

I tried taking it back to stock with flywheel didn’t make a difference I’m at a loss

 

[ballisticdoughnut]

Swap the high speed nozzle for a non jet type. You can use JB weld to block the jet but that’s a backyard way of doing it in my opinion. HDA carbs seem to have a problem with check valves anyway so best to just swap it.

 

[rahtreelimbs]

Right on the money!

 

[rahtreelimbs]

You need to block off or replace the hi speed nozzle.

 

[Jwilliams]

Replace it with what?

 

[ballisticdoughnut]

Replace it with what?

Look up dyno Joe on YouTube. He just made a video on replacing a high speed nozzle on the 590/620.

 

[ballisticdoughnut]

 

[vizette]

Replace it with what?

https://www.arboristsite.com/threads/echo-590-timberwolf-h-setting.301438/page-6

 

[rahtreelimbs]

This nozzle.

 

[Jwilliams]

Alright guys I replaced the high speed nozzle and that solved the problem revs great now there is a problem with my idle. I can adjust it to where it’s hardly staying running and 5 mins later it’s revving at like 1/4 throttle at idle. Nothing is consistent. Any input