These are 34mm Lectrons that were used one season on a 4mil alcohol drag banshee. They have been professionally modified for use with methanol and have dual power jets on each carburetor. The great thing about Lectrons is they can be used with gas or methanol with simple adjustment. One, or both power jets can be used on either carb. The carburetors work great, are simple to tune, and are in very very good condition. They also come with a banshee throttle cable. Both carbs have chokes. Lectrons run about $800 a pair new, not including power jet mods. I am into these more than $1000!! These carbs would be very well suited on a 350-421cc banshee on gas or methanol.