From model years 2017 to 2019, Husqvarna’s four-stroke enduro bikes were absent from its lineup. Consumers who wanted an off-road-only model designed for high-level trail riding could purchase a dual sport model, but they would either have to compromise by riding a slightly heavier and less powerful bike or stripping it of components added to make it street legal, remap the ECU, and add a less restrictive exhaust system to make it as light and powerful as the enduro models.
While that’s not an incredible amount of work, it’s more labor-intensive than just buying an enduro model. Luckily, that dilemma ended when Husqvarna brought its four-stroke enduro motorcycles back to its lineup for 2020. We swung a leg over the Austrian manufacturer’s 350cc four-stroke enduro and dual sport models last year, and got the opportunity to test this year’s big-bore FE 501, Husqvarna’s flagship four-stroke enduro motorcycle.
2021 Husqvarna FE 501 Engine
Despite the FE 501′s model name, it’s actually 511cc in displacement. The foundation of the engine is the same as the FC 450 motocross model with the same bore but a longer stroke to give it the additional 61cc. The FE 501 is equipped with an exhaust system fitted with an O2 sensor connected to the header pipe for its closed-loop EFI system. The muffler has a United States Forest Service (USFS)-approved spark arrestor, but it’s not the same fully restricted silencer that comes on the FE 501s dual sport. The bike also has a reed valve in the airboot to help keep the noise within EPA regulations.
Credit Source : cycleworld.com
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