The Husqvarna 51 chainsaw was introduced in 1990 by Husqvarna Vapenfabriks AB, a Swedish company renowned for its quality outdoor power equipment. This chainsaw had a powerful engine displacement of 51cc (3.1 cu. in.), and its cylinder bore was 45mm (1.77 in.), with a piston stroke of 32mm (1.26 in.). The chainsaw had a sturdy construction, with an injection-molded polymer and die-cast magnesium frame.
The Husqvarna 51 also featured an anti-vibration handlebar system, an inertia-activated chain brake, and an automatic oil pump. It had a recommended fuel-oil ratio of 50:1 and could be used with regular-grade fuel. With its lightweight design of only 5.2 kg (11.4 lbs.), this chainsaw was ideal for both professional and domestic use.
The Husqvarna 51 had a maximum engine RPM of 12,500 and was capable of delivering a manufacturer-advertised horsepower of 3.1 hp (2.3 kW). It was available with guide bar lengths ranging from 33cm (13 in.) to 51cm (20 in.).
Specifications Chart
| Specification | Details |
|---|---|
| Manufactured by | Husqvarna Vapenfabriks AB, Sweden |
| Year introduced | 1990 |
| Engine displacement | 51cc (3.1 cu. in.) |
| Cylinder bore | 45 mm (1.77 in.) |
| Piston stroke | 32 mm (1.26 in.) |
| Cylinder type | Aluminum with Chrome plated bore |
| Intake method | Piston ported |
| Manufacturer advertised horsepower | 3.1 hp (2.3kW) |
| Weight | 5.2kg (11.4 lbs.) powerhead only |
| Handlebar system | Anti-vibration |
| Chain brake | Inertia activated |
| Clutch | Centrifugal |
| Drive Type | Direct |
| Construction | Injection molded Polymer, die-cast Magnesium |
| Magneto type | Electronic Electrolux ET |
| Carburetor | Walbro WT-170 series, ZAMA C1Q-EL6, C1Q-EL7 |
| Major repair kit | K20-WAT for Walbro |
| RB-45 for ZAMA | |
| Minor repair kit | D10-WAT for Walbro, GND-33 for ZAMA |
| Air filter system | Nylon mesh cartridge |
| Starter type | Automatic rewind |
| Oil pump | Automatic |
| Maximum engine RPM | 12,500 max free with bar and chain installed |
| RPM | after break-in, 9,000 under load. |
| Idle RPM | 2,500 |
| Ignition timing | Fixed |
| Breaker point setting | None |
| Flywheel/coil air gap | 0.30 mm (0.012 in.) |
| Spark plug type | Bosch WSR7F/WS7F, NGK BPMR7A, Champion RCJ7Y |
| Spark plug gap | 0.50 mm (0.020 in.) |
| Crankshaft main bearings | Ball |
| Fuel tank capacity | 600ml (20.2 fl. oz.) |
| Fuel oil ratio | 50:1 |
| Recommended fuel octane | Regular grade |
| Mix oil specification | Electrolux approved oil, Husqvarna mix oil |
| Chain pitch | .325 in. |
| Chain type | N/A |
| Bar mount pattern | 01 link |
| Shortest guide bar supplied | 33cm (13 in.) |
| Longest guide bar supplied | 51cm (20 in.) |
| Color scheme | Husqvarna Orange |
| Illustrated parts list | Yes |
| Service manual | Yes |
In conclusion, the Husqvarna 51 chainsaw was a popular model introduced in 1990 and manufactured by Husqvarna Vapenfabriks AB in Sweden. This chainsaw had a powerful 51cc engine with a 45mm cylinder bore and a 32mm piston stroke. It had an injection-molded polymer and die-cast magnesium construction, making it both lightweight and durable.
The chainsaw had an automatic oil pump, an anti-vibration handlebar system, and an inertia-activated chain brake for improved safety. The Husqvarna 51 also had fixed ignition timing, a maximum engine RPM of 12,500, and a fuel tank capacity of 600ml. The chainsaw was designed for professional use and came with an illustrated parts list and service manual for easy repairs and maintenance.
Although it has been discontinued, the Husqvarna 51 chainsaw remains a reliable and powerful tool for both professionals and homeowners alike.