RB Designs LLC
Machine Shop Services ~ Motorcycle ~ ATV ~ PWC ~ Small Engine ~ Custom Parts Machining
rb_designs_llc001012.gif rb_designs_llc001011.gif rb_designs_llc001010.gif rb_designs_llc001009.gif rb_designs_llc001008.gif
Crank Rebuilding
Contact Us
Payment & Shipping
Carb Mods
Head Mods
Cylinder Boring
Last update
Official weather at RB Designs (our professional weather station)
Logo graphic design by Dan Thompson
In Memory of Vincent Hengstberger, "Indawoods"
This website was designed, created and published by Ron Black
KDX Stem Swap
Home of the original performance carbs with our custom made and contoured divider plate for that all around ride-abity and performance.
NEW! RB modified PWK short body 38mm carb bored to 39mm,
divider plate and circuit mods. $350.00

Also replaces the hard to tune Mikuni 38mm TMXX carb's.
< Check out our menu for services and products
I have gone into a semi-retirement, but still doing new carb mods and some head mod for the KDX 220's and some machine work on a little slower pace....
NEW! RB modified Yamaha RZ 350 carbs (one set only)

These are a set of high-preformance RZ newly rebuilt carbs that are oval bored to 27mm X 29mm then taper bored to 30mm, jetted, single pull throttle cable. These carbs are extremely streetable and makes your RZ rip!  $200.00
NEW! RB special modified Mikuni 24mm flat-slide TM carb designed for smaller engines like the KTM 65's and other mini's.

This carb is bored to 26mm and divider-plate installed, slide mod, modified air-horn, low speed circuitry mods and custom air mixture screw and driver to make tuning easier. A great high performance carb for MX racing, etc..... $225.00
BRAND NEW MIKUNI 28 MM Flat Slide Carbs
$100.00 ea. while they last