Garage Build
2025 Kawasaki KX250
BIKE Build by Twisted Development
WORDS: KRIS KEEFER
PHOTOS: SIMON CUDBY

The Kawasaki KX250 has an all-new chassis, suspension, and an updated engine as well as a smaller airbox for 2025. To me, Kawasaki made the chassis and suspension better, but I feel like the engine has lost low-end snap as well as torque feel. With my son being in the competitive 250B and 450B classes in 2025, having a bike that may be lacking in some of these engine categories could make it harder for him to get starts in front of these 120-140 pound throttle happy kids. I enlisted Jamie Ellis of Twisted Development to help this “amateur dad” to get his son some more power, but not a ticking time bomb, which is not easy to do. Everyone that races doesn’t need a full blown engine mod like this, but since I was doing one anyway I thought why not share a little on what was done to this Team Green build and if it’s worth the price of admission.
> Twisted Development
Custom HC Piston, Cylinder Head Port/Polish, Custom Low End Camshaft, Transmission REM Finish Polish/Tumble, Tuned Vortex ECU
td-racing.com
> Crank Works
Rod Kit, Press/True/Balance Crank
crankworks.com
> Pro Circuit
Ti-6 Pro Muffler System
procircuit.com
> Renthal
839 Fatbar, Half Waffle Soft Grips, 51T Rear Sprocket, 13T Front Sprocket
renthal.com
> REP Suspension
Fork Re-Spring/Re-Valve, Shock Re-Spring/Re-Valve
repsuspension.com
> Williams MotoWerx
2025 KX250 Airbox Kit
@williams_motowerx
> Hinson Racing
Complete Six Spring Clutch Kit, Basket, Inner Hub/Pressure Plate, Fiber/Steel Plates, Clutch Cover
hinsonracing.com
> Works Connection
Pro Launch Start Device
worksconnection.com
> DID
ERT3 Gold Chain 116L
didchain.com
> Dunlop
MX34 Rear 110/90-19, MX34 Front 80/100-21
dunlopmotorcycletires.com
> VP Racing Fuels
MR Pro 6 HT
vpracingfuels.com
> DeCal Works
Custom AK47 Graphics
decalmx.com
> Guts Racing
Ribbed Green Seat Cover
gutsracing.com
We are deeply rooted in Moto—We’ve been here all our lives. Back in 1998 when we turned an underground newspaper into a shiny color magazine, it immediately changed the game with its unprecedented depth of coverage, sense of humor, and access to the sport’s biggest names. Today, our readers know they can go to Racer X Online for all the news, race results, and event coverage they need, and then enjoy even more detail and perspective in the pages of Racer X Illustrated. The mag offers a chance to learn something new on every page and stay connected with the people and personalities that shape our sport—the competitors out on the racetrack, as well as the ones behind the scenes—through our exclusive deep-dive stories and columns.
Our trademark has always been insider knowledge from the experts who are at the races and around the sport. We have long prided ourselves on our unparalleled race reporting and detailed storytelling. We go deep with the riders and teams to provide comprehensive coverage you won’t find anywhere else—all with first-class photography and design. It’s a full education in motocross past, present, and future.
Davey Coombs
Editor-in-chief & Founder
Racer X Illustrated
Subscribe Now
to continue reading Garage Build
and other premium content from the pages of Racer X magazine

Get immediate access to this issue + 12 more issues
Subscribe or Renew for your FREE Sun Shade and Air Freshener (Subscribe now!)
Already have a subscription?
Login to your Account