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Mikuni TMXX Carb Mods
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RB Designs LLC
Machine Shop Services ~ Motorcycle ~ ATV ~ PWC ~ Small Engine ~ Custom Parts Machining
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Carb Mods
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Carb Mods: for the power where you want it!
From trail riding to the race track these great carb performance modifications are designed to help address many of the tuning and ride-ability issues that seem to be inherent to many of the two strokes bikes of today. Our goal is to give you that low end performance that you need and want, along with great throttle response right through a stellar top end.

Our precision machined and contoured Divider-Plates are permanently installed into the carb bore and it does not reduce the carb bore diameter in any way. Trail and Race Track Proven!
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KDX 200-220 Carb Mods
GasGas Carb Mods
Yam Twin Carb Mods
KTM Carb Mods
KX, RM, YZ - 250
TPS/PJ Carb Mods
Slide Modifications
Note! This is not a carb cleaning service, our carb modifications are precision preformance enhancements and are done to known to be good carbs off running engines. Carbs must be sent in clean condition, debris and gas free. Remove all hoses (do not send) and make sure to send your slide with carb to be modified. We always return any of your unused jets and parts.
The Original Divider-Plate Modification!
Please Note! These carb mods require some basic jetting and fine tuning skills. Our carb mod will make your jetting and fine tuning much easier and more predictable for all your riding conditions and needs.

We can install our Divider-Plate and modify most all cable operated slide valve carbs, see prices listed below. We also have complete plug and play carb mods for certain makes and models shown on the left.
$140.00 = Bore and Divider-Plate and any necessary circuit mods.
(except: TPS/electronic power jet carbs add $15.00)

$175.00 = Bore and Divider-Plate and any necessary circuit mods on 36 mm carb bored to 38/39 mm PWK AS II Carbs

$85.00 = Install Divider-Plate only (most carbs with exceptions)

$75.00 = Bore only 1 mm ~ 3 mm over (most carbs with exceptions)

$18.00 = Return shipping and handling (in the USA only)

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Carb Mod Accessories
Please feel free to Contact Us for more information
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NEW RD CARBS