The Husqvarna 550XP MKII

Catman · Oct 16, 2019

Great little saw! PERIOD...

srcarr52 · Oct 16, 2019

TreeLife said:
Someone send this man some test saws!!! Lol 50cc shootout for the win!

I’d send him my 550.

srcarr52 · Oct 16, 2019

Mastermind said:
The place where the strato divider meets the carb needed some blending

Using some things we discussed down there?

GCJenks204 · Oct 16, 2019

Randy, are you seeing any of the assembly concerns you saw with the OE?

I hope Husqvarna figured it out.

Mastermind · Oct 16, 2019

Farmchuck said:
Have you had the opportunity to port many yet Randy?

Just three so far.

srcarr52 said:
Using some things we discussed down there?

Yeppers.

GCJenks204 said:
Randy, are you seeing any of the assembly concerns you saw with the OE?

I hope Husqvarna figured it out.

Not yet. Same for the 572. No issues so far.

Derf · Oct 16, 2019

USMC615 said:
My new 550XP MKII has port envy now...sad face!

View attachment 203664

Wow, the new 50cc saw looks bigger than the older 60cc saw! ::EEK::

Dub11 · Oct 16, 2019

Mastermind said:

Chainsaws gives you the bronchitis? Wtf!

andyshine77 · Oct 16, 2019

Derf said:
Wow, the new 50cc saw looks bigger than the older 60cc saw! ::EEK::

It does. But it's also close to the lense.

nmbrlss · Oct 17, 2019

Mastermind said:
Took .030" outta the squish.

Ex: 100
Tr: 115
Stratos: 72
In: 78.5

Advanced the timing about 5°

Muffler mods like the 572XP.

Did you try to match the strato and intake timing?
Wonder if that would make a difference in fuel mileage and power

drf256 · Oct 17, 2019

Is this a quad port strato, like the 261, or a dual like the 562?

huskyboy · Oct 17, 2019

Long stroke, dual port with stuffers seems to be husqvarnas new recipe.

Dub11 · Oct 17, 2019

huskyboy said:
Long stroke, dual port with stuffers seems to be husqvarnas new recipe.

So it has a different bore and stroke vs the mk1?

huskyboy · Oct 17, 2019

Dub11 said:
So it has a different bore and stroke vs the mk1?

Nope I was referring to docs comment. New recipe as in different than what they used to do with the 346; which was quads with no stuffers and a big bore/short stroke.

Johnmn · Oct 17, 2019

USMC615 said:
My new 550XP MKII has port envy now...sad face!

View attachment 203664

Nice 262!

USMC615 · Oct 17, 2019

Johnmn said:
Nice 262!

Thank you sir...

Mastermind · Oct 17, 2019

nmbrlss said:
Did you try to match the strato and intake timing?
Wonder if that would make a difference in fuel mileage and power

No sir.

Benjo · Oct 17, 2019

Derf said:
Wow, the new 50cc saw looks bigger than the older 60cc saw! ::EEK::

It's definitely a bit fatter than the 550OE, but very similar to the 261NE. I don't own the 550MKII, just a 550OE and 261NE. I did line up and compare the 550MKII with a 261NE and 562 at the dealership yesterday while waiting, and they're all nice; 261 is lighter but balance with a Stihl laminated 18 is nose-heavy. 550MKII balances great with an 18 but is heavier. 562 with 20 balanced great but is heaviest of course. 462 vs 572 and 562 was interesting, again Stihl was nose-heavy with 20" solid bar, 562 and 572 with solid 20" bars balanced much nicer, but the 462 with light 20 is close to balanced for me and is definitely light and nimble that way. Now I'm rambling.

(photo's not mine, it's from https://www.forestry.com/editorial/equipments/comparison-husqvarna-550xp-mk-ii-vs-stihl-ms-261/ )

Derf · Oct 17, 2019

huskyboy said:
Nope I was referring to docs comment. New recipe as in different than what they used to do with the 346; which was quads with no stuffers and a big bore/short stroke.

Mason, my sense of the evolution of cylinder design is the Husky 2 series was a dual transfer port design. The 3 series was a quad port design. The 5 series is a quad transfer, dual strato design. Stuffers have been used in many of the 5-series XP saws, and the stroke is generally longer than “over square”.

But just like the razor wars between Gillette and Schaefer, each adding more blades, it seems Stihl has gone to quad transfer, quad strato ports?

I wonder if Husqvarna is doing research and the “7-series” of the 2030’s will have quad/quad transfers?

RI Chevy · Oct 17, 2019

Yes they are...
LETRICK

TreeLife · Oct 17, 2019

I'd love a new 550 mk2, maybe come tax time.

The Husqvarna 550XP MKII

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