Hard Parts

Pro Circuit Ti-6 Muffler System (2025 KX250)

Kawasaki has an all new KX250 and Pro Circuit just recently came out with their latest Ti-6 version for the new green machine. With airbox changes to the 2025 version as well as a different cylinder head, this forced Pro Circuit to come up with a new headpipe and muffler. We have put time on…

ByKris KeeferDecember 16, 20240Comments

Bike Brands Exhaust Hard Parts Motocross

FMF 4.1 Ti Muffler System For Triumph TF250-X

The Triumph TF250-X is the newest 250 motocross machine so that means we haven’t had a lot of time with aftermarket mufflers yet until now. In stock form the TF250-X has a smooth low end power with a wide mid to top end but maybe lacks a little bit of excitement on low end (with…

ByKris KeeferDecember 9, 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 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

Hard Parts Tires

Dunlop Factory Spec Tire Review

ByKris KeeferNovember 6, 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

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 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

Bike Brands Hard Parts Kawasaki Performance

2025 Kawasaki KX450 Optional ECU Map

Looking for a little more pulling power out of your 2025 KX450? Try this map below and see what you think. This should help pick up (recovery) out of corners as well as give you a little more torque feeling in 2nd and 3rd gears. This map will only work for the 2025 KX450 because…

ByKris KeeferOctober 11, 20240Comments

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