Kris Keefer

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

Keefer Tested Podcasts

RMATVMC Keefer Tested Show #403: 2025 450 Non Shootout

http://media.blubrry.com/keefer_tested/pulpmx.com/podcasts/251025_keefer.mp3 Keefer walks you through all of the media 450 shootout results as well as discusses each bike and why it may have ranked where it did. Keefer will also give his rankings then give you three must have modifications for each bike to make it better, then see if those mods will help that bike…

ByKris KeeferOctober 28, 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

Bike Brands Kawasaki

2025 Kawasaki KX250 Optional ECU Map

If you'r looking for a little less engine braking and some more low/mid RPM response this map should help you. It will not pull as long in 2nd or 3rd gears but can help get you back into the meat of the power (recovery) quicker than the stock map. Yes, there are two maps loaded…

ByKris KeeferOctober 23, 20240Comments

Bike Brands Honda

1996 McGrath Themed Honda CR250R Garage Build

ByKris KeeferOctober 23, 20240Comments

Bike Brands Kawasaki

RMATVMC Keefer Tested Show #402: 2025 Kawasaki KX250 First Impression

http://media.blubrry.com/keefer_tested/pulpmx.com/podcasts/241018_keefer.mp3 Get the details on Kawasaki's new KX250 for 2025 and see how it stacks up against other bikes in its class. Is the green bike your choice for 2025? Let Keefer help you with that decision!

ByKris KeeferOctober 22, 20240Comments

Bike Brands KTM

A KTM 250 SX-F Headpipe on a KTM 350 SX-F? Why? (Video)

ByKris KeeferOctober 21, 20240Comments

Bike Brands Bolt-Ons Exhaust Hard Parts KTM Performance

Why A KTM 250 SX-F FMF Megabomb Headpipe Is Better On A KTM 350 SX-F

I originally posted a photo of a KTM 250 SX-F FMF Megabomb headpipe mated to a KTM 350 SX-F 4.1 FMF muffler and my DM’s flooded with questions. Why does it do? Why stick the 250 headpipe on the 350? Normally when you purchase an aftermarket muffler system you usually get a smoother roll…

ByKris KeeferOctober 20, 20240Comments

Bike Brands Suzuki

2025 Suzuki RM-Z450 And 50 Years Of The RM

ByKris KeeferOctober 17, 20240Comments

Bike Brands Bolt-Ons Gasgas Hard Parts Honda Husqvarna Kawasaki KTM Suzuki Yamaha

2025 MX Gearing Guide

Even though we are not into 2025 quite yet, it is 2025 new bike season and we have been logging the hours on our 2025 motocross machines. I have spent a lot of time testing on the 2025 MX machines you see below. I (as well as a couple other members of our team) have…

ByKris KeeferOctober 16, 20240Comments

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