This series on the CS-590 has shown how humble and intelligent you truly are. Great thinking, I hope it does the job and runs like a top this go around.

Hey Tinman, I accidentally found a solution to this on my saw. I was using an improper punch to drive out the high jet. Did it a couple times because I couldn’t get the depth right when I tried to put it back together. Afterwards, the saw was running poorly. Would die when the throttle was engaged. I figured I messed something up inside the carb and kept going back and examining everything. Finally it hit me. I had decreased the diameter of the tiny hole on top, essentially making it even less of a semi-fixed jet. Once I saw this, I opened up the screw on my high jet 2 full turns (originally I had it turned all the way in) and started working correctly and sounded like it could be leaned out a bit more. I’ll have to tinker with it tomorrow and get it tuned. Don’t want to piss off the neighbors running a power saw at night. Anyway, probably wouldn’t recommend doing this on purpose, but it might work out for me on this one. Cheers from Texas where everyone is about to sh*t themselves about possible ice tomorrow

Your spot on with the emissions thought. Which to me just makes the way the 590 runs even more amazing. That the engineers are that good. I got my 590 new for $200 🇺🇸. The 620pw is like $680

This is going to work! Looking forward to seeing it in wood.

Nice to be able to observe the methodology and deductive reasoning behind building a modified saw. From carburation, cylinder porting modifications, bottom end care bearings and seals, engine air flow to exhaust. Essential in deph chainsaw optimization to maximize performance. Appreciate your skill, knowledge and dedication, a true pro, thanks again for the great content Tinman. Mahalo Tinman 🤙🤙🤙...Tdawg.

Killer discussion on carbs. Thanks !

Great information and power you gave me. I've just ported my first saw and your indepth theory helped me so much. Keep it up bud!

I’m allwas learning from you! Big thanks to you and everyone on the channel. Bring on the wood

Love looking at different carbs. I’ve got carbs to old saws and random trimmers and stuff that I just like looking at and taking apart to see how they work. This is by far one of my favorite videos you’ve made 😎👍 wish I could figure out how to port like you do, just ain’t got the money too right now😂

Keep up the good work. When you get this figured out. I am going to start building my 590

Yes JB weld it, it works had to do that on my ported 620pw

I’m excited to see the difference! I have a new jet to swap out on my 590, was going to do a muffler mod after I fix this jet

Tinman, just an FYI, the CS-8000 had two different sized carburetors. The older, orange ones had a bigger one. Some of us watching are Echo people, so keep asking for information. You've halped us, let us help you. Glad you're switching the nozzle in the carb. Thanks for the videos!

I went to the dump this morning to lol rainy cold n muddy here. Stay warm.

Yeah, I kinda wish I'd spent the extra $150 on a 620. But... to me, my personal shop time is worthless and I love tinkering. Made it all worthwhile when a buddy, after running my 590, bought a 620. He likes his new saw but claims it's a dog compared to mine😀 hoping I can talk him into letting me build it a pipe and making the limiter caps disappear! Looking forward to the next video!

I just got fixed jets from an HDA 191 to put in the carb on my 590 project. Also took a look tonight at fitting a carb from a husky 365. Mind you I’d need to do some extra mods but may be worth it on ported jug with pop up piston.

Be safe my friend. Cold this year. ❤️🌲🌲🌲❤️

Great video

Wood WEISEL looks great

Ramble on. It’s real and not scripted. Great carb discussion.

Between the porting and the jet swap it should run very well. And tune closer to 1 , 1 on H/L Did the stihl jet have the band machined around it? Or did you have to line up the feed holes? I like the husqvarna jet because of the band machined don't have to worry about exact line up.

holy i was debating on whether or not to pick up a 590 lol but from what i seen here glad i didn't gotta be honest.

I have just put some dirko ht into the governor hole. Once you screw it in, it will be pressed out a little bit into the ventouri. I had to do that on my sachs dolmar 310 which I'm transforming to a 153 100cc muscle saw

I swapped high speed nozzles on my 600P so I now have full control over the fueling. Did a muffler mod on it, don’t think I’ll do the 620 carb or coil swap it runs really good as-is.

Hello this cold morning!

Hey Tinman. My friend and I Run Stihl 440/460 carbs on our Ported Echo 620,s. Just some food for thought as maybe that could be another idea for your 590 build. We pull 28,s and 32,s all day on these saws. They,re beasts and much torque. Even stock they,re Great!

👍. I'm Rebuilding a redmax 260 trimmer putting new rings in..Do I hone the cylinder on those..

My dad used to solder some of those jet holes I can’t remember which models

Hey Tinman, great thoughts about these carbs and ecxiting to change HDs. Never had the Idea to change them . Could you explain these Govenors in old Carbs and the Tuning. I have these on my Dolmar 133 and 143 . Is it a good Idea to block them? Thanks and keep doing. You‘ll get that 590 to ripp! 👍

On old stuff where the holes were wore out in the carb jets we would braze them shut and re drill to proper size. Might be easier than JB weld? Take er easy Tin Man!

I think you need my 590 next so you can get your "system" going on these, practice makes perfect 😆

I have a "like-new" 590 short block and carb. because I swapped them for 620 parts. I was going to sell them on eBay, but if this 590 keeps fighting you I might send them your way. Would you approach this differently if you had a fresh cylinder? I also have the Walbro jet similar to the one you installed here (Walbro 86-578-1). that I ordered after seeing a forum post about these saws running rich; I have not had enough trigger time to tune /lean mine out yet but will follow up with my results when I do.

Where could i buy a tiny angle grinder for porting like yours ? Mine doesn't get in well in my cylinders cause it is to big. Thanks !

You could always put more oil in your mix and then it would have effectively leaned it out. Lots of trial and error, but the outcome might have been worth it.

New 590 goes for 375 and 620 is 525 by me in the US. Nice used ones sell for pennies on the dollar

Can't find good bar and chain oIL that is take what do you think I'm from mo.usa.

What part of manitoba are you in?

Never heard of hauling water to your house before I heard you say that you do it. Can you not drill a water well,? Is the ground water too low or contaminated? Just curious.

We got blasted with 30 inches of snow ,,Toronto has come to a complete halt

Three carbs, all run rich, doesn't that say it's not a carb problem? I'm still thinking it's that long intake timing that's causing the problem. Some(*) of the intake charge is back flowing out of the cylinder, back through the carb, taking on more fuel. So the next intake charge already has some fuel in it before it goes through the carb..... (*) some - there's always some, in this case too much.

what do you haul water for? farm animals?

That jet should work fine I have a 2156 and they say the HDA 199 jet works good but the hole and it goes all the way through in mine I put a nozzle out of an HD 12 off a 372 they only have one hole in the side it seem to make a difference on how it performs for some reason tunes easier runs better

So when you made it breath better it pulled more air over the ''safety'' jet causing it to load up? Interesting. If we run dry of water the folks around here are aloud to pump from the small river down the road. We have about 50 000 liters of tank water here between our spring tanks and our rain tanks. Thank goodness we don't have to bury them to stop them from freezing.

How do they water the livestock up there?

Looks like you better know what to do when you try to port a Echo

Solder jet hole.

Lol am I the only one here that is in t shirts and shorts still? Coast of nc, it's like 65 70 now..and getting dark

Dam , I sell the echo cs590 for $420, at our shop in AZ

I feel better for buying the CS620PW 27" the more I watch you futs with the 490, because I was considering it before I realized it just wasn't going to have the power or longevity. Stock my 620 pulls fine. My 36" portable mill and ripper will be in by next week and I have no reservations. It will work. With the 5 year warranty I'll wait at least a few years before modding.

It was around-10f the other morning, I think I was the only person going about life. Ive lived much further north, that really isn’t that bad. I did zip my jacket a few times when I was out in the wind. As much to keep it from flapping around as to keep heat in.