twin carbs for a formula 125 twin anyone done it

i want to change the 19mm carb on my 125 twin . ive got a single reed block so how to .i know that its really to 50cc together any ideas cheers russ

 

I just used a 21.5 mm one from a dragster.. Better off buying 2 polini read blocks, as this will increase the surface area of the reads
You Will need to do some fettling and Dremal out the manifold to help with the flow..
This combined with the endys gives more power...
You don't want to go too mad cos the cranks are weak.. And can't handle too much power..