Tinman, whats the deal with the Echo Cs 590??

[dynojoemods]

Raise the transfers to 118~122 primary and secondaries, swap the nozzle in the 620 carb. Should make a very agressive saw. While raising the secondaries be careful not to go too deep, up around 120 the top gets thin, if you get agressive trying to flatten the roof. If you need/want I have extra 590 cylinder. Good luck, and keep up the good work.

[TheOneinjun]

Your becoming my favorite saw porter. You explain things more then the others I watch.

[tomsommer]

After watching all these video’s I finally figured out how to start the 590. LOL I love it now for the class it’s in. 2 to 3 pulls now and it starts. No flooding. Thank you

[ChippyOutdoors]

Your theory makes total sense, in a nut shell if it is the upper transfers you can't bleed off all the pressure causing a pressure build up in the case/transfers and bleeds back into the intake. Your explainations and illustrations on this stuff is the best I think. Great work 👍 nice hewing hatchet!

[Finom]

Tinman, your educational videos and closeups are amazing and the best to making your point that you are teaching us. Wealth of information.

[jordantreentravel]

Tinman,
my first saw and mod, CS 490, pulled 13 500 wide open with the limiter caps removed. I tuned it down to 12 500 because I'm happy with the performance for what she is. Man, it is a torque monster. she cuts slower than a stihl but the torque is great for a couple hundred bucks.

[petegraham]

Good on you! That explanation is perfectly logical ! I used to tinker with two strokes in late 70, s not for speed but for torque and reliability as we were riding in the wilderness of north western Canada .

[zachgordon]

I am in the same boat, I started with a ms270. Run my 272 husqvarna most of the time. Big wood 394 the kids get the small saw.
Thanks for sharing always enjoy.

[Jo-twkr]

Great video, really appreciate your expertise and perspective.
About 8/9 months ago I purchased a 590, after seeing your vid 590 v.562xp Husky. Typically don't cut much wood a year, so didn't want to spend big cash, but also didn't want a saw I was going to struggle with every time I wanted to use it... since then we have had 2 bad storms, not typical for me, and ended up running the crap out of it with 6 downed oaks and some busted up white pine along with sevrral trees for neighbors. I couldn't be happier! Probably a mix of Echo being solid and having went to it from a PP $145 saw :-) either way, very satisfied with the 590.
Thanks for all the work you put into these videos!

[shaner]

🙄, totally followed everything you said brother. If the entire charge can't escape through the upper transfers then it can't be lit.. On the downstroke that unspent charge will escape through the muffler as the fresh change is being pulled into the case. The process needs that change to be Forced through the transfers. If the spark is hot then there shouldn't be a problem burning what's being compressed. I know I'm babbling Tinman but I think we are pretty much on the same page.. BTW, I'm a diehard 266 man, just ported another one and trying out a Molybean piston from Duke's. Quite a bit lighter than stock and seems like a very hard coating.. I'll pull it apart after cutting a few chords and see how the coating stands up. Once again we are all thankful for the time you put in to all the great videos. The new phone takes very crisp vids brother.. SLANT'E

[tazman-kennyfuller]

yeah Tinman more knowledge. Man I love this stuff. Thanks for the update on the 590. Love it. 🌲❤🌲✊🪓

[gidderman]

As with any custom work there will always be hiccups. For me the 590 in its stock form cuts everything I need at a "decent pace". It's a saw for the everyday man, at a price that is acceptable. I like the idea of erking a bit more out of it with the carb and coil. Perhaps porting might be better suited for the 620 since it already comes with the coil, carb and a 2 ring piston, but then again like you said this is unexplored territory and the bigger saws will always be faster when built right.

[travisweldmaster]

Can we get an applause for uncle harve makin a public appearance and seems to be doin ok, love ol ironhorse too, my saw building gurus

[aaronpowell]

Thanks for giving us an update! The way you explained it, makes perfect sense👍 glad I resisted the urge for the time being to grind on my 590 when removing the base gasket. Had the tools ready and told myself, you better not, Tinman's not happy with Caleb's saw at the moment. I know you'll get it. Excited to see how, when that time comes!!

[brentwandell]

Thanks for the advice on putting in bearings I used it on my Polaris ranger. I put a new front wheel bearing in freezing the bearing then heated the hub. It worked perfectly thank you.

[markatkinson]

27:00 the 550 M2 I find pulls a 20" just fine and is plenty powerful to cut decent size logs. If you got something bigger, you need a bigger size saw.

[yveslarose]

You're right on the money
It's so much clearer now

Make it easy to understand those principles for porting saw's

Im beginning in this world of 2 stroke mod's and i like your way of explaining how it works

Thanks for sharing all that information.

[alexandredionne]

If you’re right, I will grind the jbweld on the intake of my cs-490 and do transfert work because it had the same problem before the jbweld. I don’t care a lot about durability, but I have big fun running this saw. Thank you tinman, great channel!

[gregyoung]

Hi tinman I am Greg young my experience with 2 strokes is in 1990s I built race jet skis and milled heads decked cylinders and ported for several local shops . Lately I have been porting chainsaws. I ported a cs620p similar to yours I do duration no opening time . Exhaust 163 intake stock height wider slightly nothing to transfer openings except chamfering better. I also put pop up piston in sea level here I have 165 psi compression no base gasket. I dont cc unless I have removable head . Opened up lower transfers slightly . I know the more porting is done that slot more compression is needed dont know if this is difference or something else I is going on. A popup piston is cheap and might be worth a try. hope it helps . I like your videos I am just another guy in garage Greg

[JohnDoe-udcc]

I hot rodded an echo cs400. It’s a light little 42cc power head with a custom 20 inch bar running a full chisel. I can bury the whole bar into hard oak and it doesn’t even slow down and it just throws chips. It’s 42cc’s out cuts every other saw I’ve ever seen under 60cc’s. I love roosting chips in my friends faces that are running much bigger and more expensive saws. To top it off, it can sit for months and I can go start it within 3 pulls, even on a 20* day.