Yamaha

Yamaha YZ450F Flywheel Weight

If you’re a Yamaha YZ450F owner you know that your bike can be a handful at times. If it’s not a handful then you can disregard this test altogether. For me the YZ450F is one of the best bikes in the 450 class for 2025 but it still needs some work to be an easy…

ByKris KeeferJanuary 4, 20250Comments

Bike Brands Hard Parts Performance Yamaha

Tested: Yamaha YZ250F With Dual Injector

ByKris KeeferJanuary 2, 20250Comments

Bike Brands Yamaha

2025 Yamaha YZ450FX Off Road Race Test

Written/Tested By: Michael Allen It had been some time since I lined up to race a National Hare and Hound (NHHA), but when Keefer brought up the idea that he and I should compete in the final round of the 2024 series it sounded fun. Initially I had no reservations and didn’t hesitate to saying that…

ByKris KeeferDecember 16, 20240Comments

Bike Brands Yamaha

2025 Yamaha YZ450F Mods That Work

ByKris KeeferDecember 4, 20240Comments

Bolt-Ons Hard Parts Yamaha

YZ 250/450F Brembo Brake Mod (Re-Visit)

So are you tired of that spongey feeling stock Yamaha brake? Since I get to ride all the bikes, I would have to say that the Brembo system is one of the best feeling brakes out of all the MX machines. However, a little mix and matching can get you a more linear feel than…

ByKris KeeferNovember 11, 20240Comments

Bike Brands Yamaha

2025 Yamaha YZ250F World Vet Race Test

It has been about a year since I raced motocross when I heard rumblings of Matthes and Keefer racing the Glen Helen Vet Nationals in early November. If you know Kris, it only takes about one phone call that can involve some verbal motivation and next thing I knew I was on the Glen Helen…

ByKris KeeferNovember 10, 20240Comments

Bike Brands Hard Parts Performance Yamaha

Optional 2025 Yamaha YZ250F ECU Map

If you're looking for a little more low end and increased mid range recovery, this "RESPONSE" map will help in those areas.

ByKris KeeferNovember 7, 20240Comments

Bike Brands Yamaha

Inside Phil Nicoletti’s Club MX/FXR Yamaha YZ450F

ByKris KeeferOctober 30, 20240Comments

Hard Parts Suspension Yamaha

2023-2025 Yamaha YZ450F Optimal Swingarm Measurements

I am not going to sit here and tell you that you need to be as meticulous as we are at times here at Keefer Inc. Testing but if you like to tinker and make adjustments here are some key swingarm pivot to center of rear axle lengths. I have tried a lot of different…

ByKris KeeferOctober 29, 20240Comments

Bike Brands Performance Yamaha

2024-2025 Yamaha YZ450F Optional ECU Maps

If you're looking for some optional maps to try for your 2024-2025 here are two recently that I have tried. One map has more torque feel yet has more connectivity because of the TC setting. The second map is more aggressive, has less engine braking but has a good amount of traction out of corners…

ByKris KeeferOctober 27, 20240Comments

Sign Up to Our Newsletter