Keefer Tested

Yamaha went to work on their YZ250F in 2027. The YZ450F receives no significant changes in the new year but the 2027 250F adopts the same 450F frame geometry and also gets a ton of engine revisions as you will…

KX327X & KX327 HIGHLIGHTS ●        327cc Fuel-Injected, Liquid-Cooled 2-Stroke Engine ●        Electric Start ●        Hydraulic Clutch ●        Power Modes ●        Smartphone Connectivity Via RIDEOLOGY THE APP KX2* ●        Lightweight Aluminum Perimeter Frame ●        Factory-Style Suspension and Brakes ●        Adjustable Ergonomics…

What Is New For 2027:  • 9.9-pound weight reduction. Curb weight is 238.1 lbs. Weight without fuel is 226.4 • Revised base geometry & rider position. Wheelbase is now 58.7 inches— 0.3 inches longer than before—and the rear axle is…

If you’re looking to get away from the stock Nissin hydraulic clutch and go back to a cable actuated system on your 2026 YZ450F, these part numbers below will be exactly what you need to go back in time and…

The Yamaha has the best suspension in class but in 2026 it isn’t as comfortable as it once was. We recently had a chance to ride our test bike(s) in Georgia and in California in order to try and get…

I went to Perris Raceway and tried Steve’s Pro Circuit Ti-6 muffler system w/ that RED carbon end cap! The updated Pro Circuit Ti-6 Titanium Exhaust System for the 2026 YZ450F is constructed of titanium throughout the head pipe, mid…

The 2025 and the 2026 YZ250F are the same exact motorcycles. In 2025 the suspension valving got a little stiffer and also got a different linkage so the rear spring went from 56N/m to 54Nm. After a long time spent…

The Yamaha YZ450F underwent some chassis and engine changes in 2026 and it seems to be a hit in a lot of 2026 450 media shootouts. At the time this went out to you all, Yamaha has acquired three 450…

The 2026 Yamaha YZ450F has seen some changes to its engine character. With a new muffler that is a 109db system that all manufacturers will have to adhere to. Yamaha also changed the port sizes in their head and put…

Did you know that the 2026 Yamaha YZ450F comes standard with a heavier flywheel (over the 2025). With that being said we did go to an aftermarket heavier flywheel weight in 2025 (Bundy Built Flywheel) for better control of the…

Looking for a little more pulling power out of your 2024-2026 Yamaha YZ250F without busting inside of your engine? Andrew Flores, the head of RT Engine R&D, has developed an airboot for the 2024-2026 YZ250F that improves power by 4%…