The lectrons are a taper bore, these specific carbs are the high velocity versions, meaning they are 40mm on the back side, 34mm in the middle, 38mm on the engine side. Very nice carbs in my opinion and worth the money.
What brand? Are they Mikuni flanges? If so what is the number on the flange or what is the distance between the bolts center to center on the flanges? It will either be 60mm or 70mm
I'm in search of some trex cylinders. I would like for them to be 68-69mm and either for a stock or 4mm crank. Lets start with that and see if anyone has any.