Power - Keefer, Inc. Tested

Twisted Development Airbox Mod (2024 Yamaha YZ250F)

Do you got a 2024 Yamaha YZ250F and used to own a 2023 Yamaha YZ250F? Do you miss a little bit of that 23’ low end punch out of your 24’ YZ250F? If so, there is hope and that hope lies with Jamie at Twisted Development and their Air Boot Kit. Let’s break down the…

ByKris KeeferDecember 31, 20230Comments

Bike Brands Hard Parts Performance Yamaha

2024 Yamaha YZ250F Optional ECU Maps

If you get your 2024 Yamaha YZ250F and it runs a little dirty/rich down low, have no fear, these maps should help this and help with manipulate the power a little. the Keefer Free Feeling Map 2.0 will get you less engine braking (maybe a little less torque), but pull stronger through mid-top end. The KK…

ByKris KeeferOctober 18, 20230Comments

Bike Brands Bolt-Ons Exhaust KiT KTM Performance

HGS Exhaust System For 2021 KTM 250 SX-F

Something that most riders (including me) may not see a lot of in the states is HGS exhaust systems. HGS is a Netherlands based company that has been making exhausts since the early 90s and are mostly popular among European club riders and of course many factory supported MXGP teams. I had the chance to…

ByKris KeeferFebruary 8, 20210Comments

Bike Brands KiT Motocross Suzuki

2020 Suzuki RM-Z250 Tips/Tricks Part #1

Written By: Colton Aeck Greetings, I’m Colton Aeck. You may recognize my name from slugging it out as a privateer at your local Supercross or Outdoor National. If not, I’m 24 years old, a professional racer and working on being a half decent test rider too. While practicing in between Supercross races in January I…

ByKris KeeferJune 4, 20200Comments

Bike Brands KiT KTM Motocross

2020 KTM SX-E 5

Electric motocross technology is not anything new. It has been in the off-road world for quite sometime, but getting one of the major five manufacturers to get on board with it has been somewhat difficult. Until now… My son’s first two wheeled motorcycle was an Oset electric trials bike and that proved to be the…

ByKris KeeferJanuary 20, 20200Comments

Bike Brands KiT Motocross Yamaha

2020 Yamaha YZ250F Top 5 Mods

Written By Michael Allen And Kris Keefer: The YZ250F is one of the best 250 four strokes in class for 2020, but that doesn’t mean it can’t be made even better. Here are five easy and relatively inexpensive modifications that will make you love your 2020 YZ250F even more. 1. Keefer “Free Feeling Map”: The…

ByKris KeeferJanuary 8, 20200Comments

Bike Brands Bolt-Ons KiT Performance Yamaha

Twin Air Power Flow Filter Kit (Yamaha YZ450F)

If you want to get rid of the somewhat janky stock air filter cage system of the 2018-2020 YZ450F, go with the Twin Air Power Flow Filter Kit. To me the Twin Air YZ450F PowerFlow kit is the best all-around filter system for the YZ450F airbox. Why? With this kit, Twin Air replaces the stock…

ByKris KeeferDecember 3, 20190Comments

Bike Brands Bolt-Ons Exhaust KiT Performance Yamaha

FMF Vs. Pro Circuit (2020 Yamaha YZ450F Muffler Comparison)

Yamaha did a great job with the stock muffler and I bet if you ask any aftermarket muffler manufacturer they would tell you the same thing. If you’ve seen my social media pictures while riding the Yamaha YZ450F, you will see that I run the stock system quite a bit. Why? Because it’s really good!…

ByKris KeeferNovember 25, 20190Comments

Bike Brands Bolt-Ons Exhaust KiT KTM Performance

FMF Factory Fatty Pipe/Shorty Silencer (2020 KTM 125SX)

Since the delivery of our KTM 125 SX, my son Aden has been riding it non stop. He also has been barking in my ear about getting a pipe and silencer so it “sounds cool”. While I am usually reluctant to add parts to my kid’s bike for the sake of just doing it, I…

ByKris KeeferOctober 23, 20190Comments

Bike Brands Bolt-Ons Exhaust KiT Performance Yamaha

FMF Factory 4.1 Slip-On (2019 Yamaha YZ450FX)

Story By: Michael Allen The simple fact that more manufacturers are offering off-road closed course competition bike’s brings a smile to my face since at heart I’m an off-road lover. That being said I feel like most manufacturers should know that 99% of all off-road racing organizations require race bikes to be equipped with a…

ByMichael AllenFebruary 14, 20190Comments

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