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ACS Racing
Modifications to the TTR125L and CRF100


The Riders
The BBR150
How to do it from the factory books
Results at the Victorian Junior MX Titles 2003
Thumper X Pictures
Things to make your bike go fast.
ACS Racings prefered products.....
The Honda CRF100
The Yamaha TTR125L
Who is ACS?
ACS Racing in the Press
Things that break...................
Modifications to the TTR125L and CRF100
Taylor on the Honda CRF100 in 2003
Taylor's BTX Motorcycles KTM SX85 B/W
Matt on the TTR125 in 2003
Taylor on the Yamaha TTR125
Tyrone on the Honda CRF100
Ryans Yamaha YZ250F

Whats been done to the TTR and the CRF

2001 Yamaha TTR125L
  • Powroll cam
  • 26mm Mikuni carb
  • 125cc capacity
  • Flywheel lightened
  • Heavy duty Yamaha valve springs
  • Ported head / Intake manifold matched
  • Yamaha YZF ignition
  • Vented rocker box
  • Milled barrel
  • BBR pipe
  • BBR frame cradle
  • Yamaha YZ80 USD front forks, resprung and revalved by Krooztune
  • Yamaha TY250 rear shock with full rebound and compression dampening extensively modified by Krooztune
  • Black Exel rims
  • Stainless steel spokes
  • Talon hubs
  • Kawasaki KX100 rear disc setup 
  • Braking wave discs
  • Tag mini high X5 bars
  • Cemoto throttle
  • Honda CR 80 '97 throttle cable
  • Renthal grips 
  • Extensively modified air box and aircleaner setup
  • Yamaha YZ125 fuel tap
  • Yamaha YZ125 clutch springs
  • 14 / 49 or 15 / 54 gearing
  • BBR chain guide
  • RK chain
  • Dunlop D756 tyres
  • Braking disc pads
  • Shell Ultra oil / Caltex Vortex ULP fuel

2002 Honda CRF100
  • Frame, intake and exhaust modifications by Scott Williams
  • Honda CR80 big wheel wheel frame with 2002 plastics and graphics
  • Honda XR100 motor
  • Takegawa big port super head
  • Takegawa S cam
  • Takegawa 115cc barrel and piston
  • Kitaco small rotor CDI ignition
  • Custom pipe and muffler
  • 26mm Mikuni carb
  • Cemoto throttle
  • Twin Air aircleaner
  • Braking disc pads
  • Renthal grips 
  • Tag mini high X5 bars
  • Shell Ultra oil / Caltex Vortex Gold ULP fuel

This is basically the 4th generation motor.

I have tried a lot of cam, carb, valves etc in getting here.

If you want some info on building the Honda XR100 or Yamaha TTR125 motors email or check out

If you want to see some things that just didnt withstand the pressure of racing click here.