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Good heads-up, thanks!! Is Duke still considered kinda 'gold standard for aftermarket'?

That took a couple reads but I think I do understand, if I have 660 cases (as I do) then most of the 056 stuff is no good except for the 056II 56mm? That's actually precisely what I was hoping for, because I've rebuilt one of my 660's with 56mm big-bore kit but I had to go through 3 kits ROFL...

Why is that, Re the retailer L.R.B.? Don't think I've ordered from them yet but had been eyeing their 056 56mm piston (beautiful domed crown) but still waiting to find for sure that it does/does not fit the 660 connecting-rod (I'm trying to find any other 56mm windowed piston, pretty much any...

I hate bumping an older one but it's precisely what I'm looking to understand- Does the Stihl 056 cylinder & piston setup fit onto a 660? Bores aside, am talking about for instance cylinder bolt-up, and - most importantly to me - whether an 056 piston will sit on a 660's connecting rod? I'm...

So.....does this 56mm Stihl 056 piston fit the big-bore 660 top ends? Looks like it's about the right size, wrist pin is 12mm AFAIK....reallllly hoping to find a 660 56mm piston so I can use big bores and actually machine a bit more (w/o freeporting....on that note I'd love to know what the...

Figured it's better to ask here than make anew, despite the age of this thread. Does the t525 take the 'common/ubiquitous' gas&oil caps from the 550xp? Basically, the only cap Husqy seems to even offer? I'll update once I get them in-hand, but this is actually for my Echo cs2511T, saw someone...

Re rings, it seems you basically have to go OEM? Out of curiosity, what do ring failures typically look like? I'm guessing they're catastrophic often enough that going OEM here is worth the $30+? Am trying to be frugal but will get what's necessary to re-do this saw right, I want it in my...

I didn't realize what an open-hole the muffler was to the exhaust-outlet, I got nearly 1hr into usage and it failed w/o much noise/incident, just kinda "turned off". I subsequently thought I had fixed it, and I had it running well-enough (didn't realize my piston was chipped) with extra L and...

Yup this is the video I was referring to, he distinctly says the 620, in-addition to some alloy parts instead of plastic*, that the 620's superiority is under the hood and due to 'more aggressive ignition timing and port timing' clearly making a distinction to mention both, would LOVE seeing a...

I'm left wondering how the 620 carb can help a 590 when the 590's OEM carb (without modification) seems so rich you couldn't lean too much if you wanted to, wouldn't this kinda imply the carb is more-than adequate? I wish youtuber 'Tinman's Saws' compared a stock 590, to a muff-modded 590-- he...

Hate to jam-in a Q like this but expect anyone who can answer ^ my OP could answer this and this doesn't deserve a thread..What is the norm for oil% for you guys? I'd gone to 40:1, then 45:1 which is where I am now...Donny Walker says to go by the label (50:1) and I put weight on his opinions...

Will start with the latter item (these are in-relation to my 590's "hot woods-port" project but also just to understand!) Decomp valves are often removed, am uncertain if the chief reason is their potential to fail, or their OEM characteristics (my understanding is they ALL cause some...

Anyone come up with a good "workaround" for this? This black "insert" inside the air-filter prevents the carb's spit-back of air/fuel mix into the filter, which wets the filter's rear wall especially the bottom and it attracts dirt like no other, so having SOME kind of "spit-plate" in there...

Oh also......I cannot figure out something-- is it considered dangerous / too-close-to-edge to do a "keyway ignition timing advance" in addition to the porting? Watching some of mweba1 's youtubes on his 7310 ports and he's still adding a degree or two via the flywheel....hrrrmmm

I know I alluded to it but want to be clear on my misunderstanding here in hopes of learning: I still cannot figure out why there's so little, sometimes zero, widening of the ports? Is it that they're typically already coming spec'd as wide as the piston allows? Even if that were the context...

I found my 6A die grinder was fine for doing my test porting.....I was gonna get a variable-speed setup for it (it's fixed 25k), but then saw how cheap the Dremel kits were... Would you guys consider a 1.5A dremel suitable for this stuff? Would it be powerful enough to drive the "right type"...

Couldn't find a 620 (heck my 590 was a floor model) so am very aware that upgrading to its carb and/or coil may be worthwhile here, I'm going to do a "tinman style" porting job (if anyone's familiar w/ his recent 590 project) but have also read most of the old threads here and on OPE and feel...

To the OP and everyone in the "these echo's, at least 590/620 series, are lean lean LEAN" camp, could you help me reconcile your sentiment with the sentiments on OPE(outdoor power equipment forums), and on the Tinman's youtube series on the 590 he recently finished, that they cannot lean it out...

Honestly i think the best/only real advice is "watch more carb-tune vids and get better at tuning" :/ That said, and FWIW I barely have any time on my new 590 and also still tuning it but despite there being a lot of talk about "too lean" settings on this site, on other sites (*********) and...

There is pretty unanimous sentiment the 590's are shipped rich not lean...from plenty of people on *********, from tinman on youtube, not only that they're generally set a bit fat but also that you cannot over-lean even if you tried, even if you seated the H screw there is a bypass valve that...