Racer X Films: 2025 KTM 450 SX-F Garage Build

The 2025 KTM 450 SX-F has some chassis updates that help improve comfort, but we didn’t want to stop there. We still needed more comfort as well as some added power that retained the linear feel of the stock engine but added more torque for exiting corners. Building the ultimate vet bike may mean a lot of bling to some, but in my eyes it’s a bike that may look stock but underneath that stock looking exterior, the interior is a weapon that makes it easier for us older guys to ride harder more safely. This Garage Build goes out to you KTM owners that want a bike that is clean looking, yet is a weapon on the track.

Build: Kris Keefer
Video: Simon Cudby

Parts List:

FMF Racing
Factory 4.1 Full Muffler System (with insert in)

XPR Motorsports
Vortex ECU with Custom Mapping

WP Suspension
Factory Split Triple Clamp

Twisted Development
Exhaust Flange

REP Suspension
KYB Fork 25mm Cartridge Kit, WP Valved TRAX Shock Linkage System, Top Engine Hangers

Renthal
672 Fatbar (cut to 802mm), Half Waffle Soft Grips

Hinson Racing
Complete Clutch Kit

Dunlop
MX34 Tires, 120/80-19 (rear), 80/100-21 (front)

VP Racing Fuels
MR Pro6-HT

DID
Ace Orange Wheelset, ERT3 Gold Chain

Zero Resistance Throttle
Throttle Tube (black cam)

[TheDocrick]

Kiefer you are the man!! Keep up the great work, you break down in a way us old heads get! Thanks Man and keep going!!

[BikesandBlickeys]

Ran 996/827s on my yamaha and loved them. When I got my ktm they felt really wide. Went to a 839 which according to renthal is the same as the 827 just 10mm less wide and loved it. Rode my Yamaha couple weeks ago when the ktm was down and when got back immediately cut the 827s down a bit. Significantly better.

[jcaldy]

Have you tried the new closed chamber fork that comes on the xcf and excf 🇦🇺

[alexxela]

Did the clutch cover really wear off that fast?

[MXJEFF]

Is REP with AEO still? Or did they split?

[Es_Scott]

Isn’t chase running kyb still a unconfirmed rumour, surely wp / ktm no matter how better or worse it may be wouldn’t do that, ESPECIALLY still running the WP tubes and logos, still can’t believe that’s true

[cbRTXTI]

I brought a fc450 23 model the fuel pump or injector died 10 hours in and i havent touched it in 12 months lol i miss my yamaha

[brianchase]

Wouldn't it be cheaper to turn a Yamaha into a Ktm, than a Ktm into a Yamaha .

[usmcchet]

An additional 3 grand in a bike that already cost 11, 000. I’ll just buy a Suzuki RMZ 450 put 4 grand into it and I’ll be good. And it still be cheaper. Than that KTM (KEEP TAKING MONEY) machine

[barnescycle]

I ordered this magazine a couple months ago and I still have 0 underwear 👎