Husqvarna 450S Rancher 20-Inch 50.2cc Gas Chainsaw

What you get with article 970702318

Amazon lists this 450S Rancher under model and part number 970702318, and Husqvarna's product page shows the same article as 970 70 23-18, described as the 20-inch, .325-pitch Smart Start version for the US and Canada. That is a direct match between the listing and the maker's page.

Husqvarna's page says this configuration includes a 20-inch sprocket-nose bar, SP33G X-Cut chain and mounted bucking spikes. Husqvarna describes the 450S as a landowner saw for felling, cutting, limbing and firewood, and the listing's recommended bar range of 13 to 20 inches matches the maker's table.

Engine and chain figures

The specification table gives 50.2 cubic centimetres and 3.2 horsepower net under ISO 7293, with maximum power at 9,600 rpm, idle at 2,800 rpm, clutch engagement around 4,150 rpm and a chain speed of 60.7 feet per second. Maximum torque is 2.6 newton-metres at 6,900 rpm. One listing bullet rounds the engine to 50 cc; the table and title say 50.2.

The chain is .325-inch pitch and .050-inch gauge on a Spur 7 sprocket, and Husqvarna's FAQ names SP33G X-Cut as the chain the 450S uses. Use those figures, and the chain type Husqvarna names, when you buy a replacement chain. The saw has an automatic oil pump and a 0.55 US pint chain-oil tank.

The weight figure on Amazon is not the maker's

Husqvarna lists the weight as 11 pounds excluding cutting equipment. Amazon's item details say 14.9 pounds, and neither figure covers fuel or bar oil. The maker's 11 pounds leaves out the 20-inch bar and chain, so the saw in your hands will weigh more than that.

No source we read explains what Amazon's 14.9 pounds covers, so use the maker's figure and ask the seller if the difference matters to you. Husqvarna also gives a sound pressure level of 106 dB(A) at the operator's ear and vibration of 3.9 metres per second squared at the front handle and 4.1 at the rear.

Features Husqvarna lists, and the first-use steps

Husqvarna lists a hybrid plastic-and-metal crankcase, Smart Start, an air purge primer, Air Injection, LowVib dampers, a quick-release air filter, a retained bar nut, a snap-lock cylinder cover, a transparent fuel indicator, a flip-up fuel cap, felling marks, side-mounted chain tensioning and a stop switch that resets itself. It also has an inertia-activated chain brake.

Husqvarna's FAQ says that if the saw arrives unassembled you remove a plastic spacer near the bar stud, fit the bar and chain, and check and fill the bar oil, then refer to the operator's manual for detailed instructions and safety information. No manual is attached to this listing; use the one in the box for all operating and safety procedures.

The five-year warranty needs two things

Husqvarna's FAQ gives the 450S Rancher a two-year limited warranty for residential use. It says you can extend that to up to five years by buying at least 96 fluid ounces of Husqvarna pre-mixed fuel and oil at the same time as the saw and registering the product online. The listing mentions the fuel purchase but not the registration step.

The 2026 warranty document on the listing does not mention the extension at all, so keep the receipt showing both purchases together and complete the registration. Husqvarna's FAQ says registration is otherwise recommended but not required for service, and that you should keep proof of purchase for the whole warranty period.

What voids or limits the warranty

The FAQ says wear parts such as air filters, spark plugs and chains are not covered, and that commercial, agricultural or rental use, skipped maintenance and non-approved fuels such as E15 or E85 void the warranty. The 2026 warranty document adds exclusions for stale fuel, starting fluids, pressure washing and damage from mismatched bar, chain or sprocket pitch or gauge.

The two maker documents do not line up on commercial use. The FAQ says commercial use voids the warranty, while the 2026 chart gives 90 days of professional coverage on its row for consumer and residential 100 and 400 series handheld petrol products; the chart names series, not models. Ask a Husqvarna dealer before buying this saw for paid work.

Warranty service goes through an authorised Husqvarna servicing dealer, and both documents say transport costs are yours. The warranty document asks for proof of purchase showing the date, model and serial number, and says continued use after a failure is not covered.