Ktm Sx 450 Review

Item: Ktm Sx 450
Rating: 8.5
Author: Motoryk

"Extraordinary machine that ruthlessly punishes neglectful owners and rewards disciplined ones."

Experienced motocross racers wanting genuine factory performance $4,500-$7,500 used 2016-2022

search Inspect a Ktm Now

dashboard

Key Specs

speed

Top Speed

~145 km/h (estimated; note: motocross bikes are not optimized for top speed, this is an approximate real-world figure)

bolt

Power

~63 hp

@ 9,500 rpm (estimated for modern 2020+ generation)

rotate_right

Torque

~54 Nm

@ 7,000 rpm (estimated for modern 2020+ generation)

local_gas_station

Fuel Economy

14.3 km/L

34 mpg · ~7–9 L/100km (estimated; highly variable depending on riding intensity — note: motocross bikes are not typically measured by fuel economy)

build

Service Every

15 hours

scale

Weight

~106 kg

(wet/curb weight, varies slightly by model year)

settings

Engine

449.9cc single-cylinder 4-stroke SOHC

height

Seat Height

960 mm

cog

Transmission

5-speed

favorite

Engine Lifespan

Top-end rebuild typically at 40-60 hours of racing use

chevron_right

Used Buyer Review

The KTM 450 SX-F is a weapon, full stop. It's the bike that professional factory riders actually race, which tells you everything about its capability — and also everything about its demands. Used examples are everywhere because weekend warriors buy them thinking they'll ride like Cooper Webb, then reality hits hard around lap three. That's actually good news for savvy buyers, because you can find relatively low-hour bikes from guys who barely cracked the throttle open. Here's the honest truth: maintenance intervals are brutal and non-negotiable. We're talking valve checks every 15 hours, piston every 40. Ignore that and you're rebuilding a top end on your dime. Always ask for service records and walk away if they can't produce them. The WP suspension is genuinely world-class when properly set up for your weight, but it's stiff out of the box for lighter riders. Budget $200-400 for a proper suspension tune. Buy right and you'll have the most exciting 450 motocrosser ever built.