I run a Tilly HW 12 34mm Carb on one of my Honda CR125s and a Mikuni SNB 38mm on my other Honda CR125 shifter.
Both carbs perform very well with the smaller Tilly doing a better job on short tracks and the bigger Mikuni doing a better job on long tracks as would be expected !
Or for another take on “ON THE FLY CARB AJUSTING” look at my utube here :
FYI Shifter Go Kart Guys,
For the open/modified
class of Honda CR125 Shifters.
The very short fuel path direct fit Honda CR125 Shifter intake manifold for 38mm 2 flange bolt types of carburetors is all done .
It has a 11 degree right rotation angle
to to clear the kick start bump ( Carbs like the externally adjustable Mikuni 38mm Carbs work really well )
No more rubber boots with right angle turns to disturb the fuel flow !
And even a more perfect fit when used in conjunction with the V-Force 3 Reed Cage box .
I’m getting this experimental test carb fitted up to the CR125 Honda.
Mikuni Super Butterfly Type SBN38mm Diaphragm Pump Carburetor
No jets to change ever (well almost never) as it has easy to get to externally adjustable low & high speed mixture screws just like the Vortex RoK-tt carb only a much bigger bore (38mm) to fit the CR125 Honda engine and the fuel pump is built right in too.
I’m getting tired of always taking off the carb to change the high & low speed pilot jets and I don’t care for float types of carbs either.
These are one of the best performing and easy tuning carburators that money can buy.