Pro Circuit - Keefer, Inc. Tested

Pro Circuit Fork/Shock Re-Valve (2021 Husqvarna FC450)

Written By: Joe Oehlhof The KTM, Gas Gas, and Husqvarna umbrella was divided up by brand to target different types of consumers. KTM being the high end, ready to race model, Gas Gas being the affordable yet sufficient to go racing on model, and the Husqvarna being the mellower vet friendly all-around type of bike.…

ByKris KeeferMay 9, 20210Comments

Bike Brands Bolt-Ons Kawasaki KiT Suspension

Pro Circuit Linkage (2021 Kawasaki KX250)

The new Pro Circuit linkage system for the 2021 KX250 and 2019-2021 KX450 gives the KX’s handling performance an entirely different feel. I did this review on a 2021 KX250 because my son Aden was only 125 pounds and needed something plusher for his style of riding. Although I liked the stock KYB suspension, I…

ByKris KeeferJanuary 19, 20210Comments

Bike Brands Bolt-Ons Exhaust Kawasaki KiT Performance

Pro Circuit Ti-6 Muffler System (2021 Kawasaki KX250)

Over 300 part number changes have been made on the 2021 Kawasaki KX250. After our first day on the new KX250 I was quite impressed with its ability to pull hard out of the corner and rev out longer than last year’s model. However, even though the Kawasaki has improved for 2021, the muffler still…

ByKris KeeferOctober 15, 20200Comments

Bolt-Ons KiT

Pro Circuit Aluminum Throttle Tube

Have mostly been a plastic throttle tube type of guy, but I have appreciated the toughness of an aluminum throttle tube when I have some medium to large sized crashes. The one thing I usually don’t like is the firmness of the aluminum throttle tube when landing as well as how big they feel in…

ByKris KeeferMay 25, 20200Comments

Bike Brands Kawasaki KiT Motocross

2020 Kawasaki KX450 Engine/Suspension Updates (Living With Series)

Written By: Joe Oehlhof If your like me after having a bike for a few months you begin to get a little more particular with your bike and start wanting to try different things. If you read my article on the building of this bike (for the Vet National at Glen Helen) you know I…

ByJoe OehlhofApril 8, 20200Comments

Bike Brands Bolt-Ons KiT Performance Suspension Yamaha

Pro Circuit Link Arm (2020 Yamaha YZ450F)

I have tried links in the past on previous generation YZ450F’s with less than stellar results, but since Yamaha changed the frame on the 2020 machine, I thought I would revisit a link to see if it helps improves the Yamaha’s feel around the track. Pro Circuit's linkage arms are CNC-machined from billet aluminum and…

ByKris KeeferMarch 10, 20200Comments

Bike Brands Bolt-Ons Exhaust KiT Performance Yamaha

Yamaha YZ125 Pipe/Silencer Comparison (Pro Circuit Vs. FMF)

For over 10 years the YZ125 engine has remained the same. At one time it was the best 125cc engine around, but in recent years that award has gone to KTM/Husqvarna. KTM and Husqvarna’s latest 125cc engines have a wider powerband and is simply more exciting everywhere on the track. Compared to the KTM and…

ByKris KeeferJanuary 30, 20200Comments

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

Bolt-Ons Exhaust KiT Performance

Pro Circuit Ti-6 Pro Titanium Muffer System

The 2019 Yamaha YZ450F won the Keefer Inc. Testing shootout this year because it has all tangibles that are needed to let a rider go fast on the track with the least amount of work. I am a fan of the stock muffler system on the 2019 YZ450F, but was looking for a full system…

ByKris KeeferNovember 20, 20180Comments

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