Shindaiwa 591 vs Husqvarna 445S

Shindaiwa / Gas

Shindaiwa 591

50cc class

~$470

Husqvarna / Gas

50cc class

~$450

The Husqvarna 445S costs about $20 less; the Shindaiwa 591 has more engine (59.8cc); the Shindaiwa 591 swings a longer bar (20 in).

Spec	Shindaiwa 591	Husqvarna 445S
Approx. price	~$470with 20" bar and chain	~$450with 18" bar and chain
Engine class	50cc classby displacement	50cc classby displacement
Power type	Gas	Gas
Use case	Farm & Ranch	Farm & Ranch
Engine	59.8 cc	50.2 cc
Rated power	—	2.2 kW
Bar length	20 in	18 in
Single-pass cut	about 18 in	about 16 in
Bar range	20 in	13-20 in
Chain	3/8" pitch / .050" gauge	.325" pitch / .050" gauge (SP33G)
Weight	13.2 lbpowerhead only (dry, without bar and chain)	11 lbpowerhead only (excl. cutting equipment)
Warranty	5-year consumer / 1-year commercial	2-year residential, non-income-producing use (extends to 5 years with 96 fl. oz. of Husqvarna pre-mix fuel and online registration)

Tinted cells mark the better figure on that row alone: more engine, longer bar, lighter, cheaper. A lighter weight is only a win on the same basis.

59.8cc for $469.99 — the same money as Echo's CS-590 Timber Wolf, with a decompression valve added
Decompression valve directly addresses the extra cold-start pulls the CS-590 is known for
Professional-grade aluminium body rather than the CS-590's plastic case
G-Force engine air pre-cleaner and tool-less two-piece air filter stretch maintenance intervals
Translucent fuel tank for quick level checks, and an automatic adjustable clutch-driven oiler
Owners report buying a second one after regular firewood service on the first

13.2 lb powerhead gets tiring on long cutting days, as owners note directly
Shindaiwa lists only a 20-inch bar for this model — the Echo CS-590 offers 18, 20 and 24
Dealer-only sales and service, with no retail review aggregate to check
No purge bulb, unlike the smaller 335S and 493
Standard recoil starting rather than the reduced-effort system on Shindaiwa's smaller saws

Tool-less side tensioner — no scrench needed to retension a stretching chain
50.2cc for $450 is the cheapest route into Husqvarna's 50cc class
11 lb powerhead is light for the displacement, a quarter-pound under the 450X Rancher
Shares the .325/.050 SP33G chain with the Rancher saws, so bar and chain stock is interchangeable
Warranty stretches to 5 years if you buy pre-mix fuel at the same time and register

2.2 kW is the lowest output of any 50cc saw Husqvarna sells — the 450X makes 2.5 kW
20-inch maximum bar is generous for the power on tap; 16-18 inches is the realistic working range
Residential warranty only — commercial and rental use voids it outright
No AutoTune, so altitude and seasonal changes mean a carb adjustment