I bought a 87 banshee with toomey t3's and 270 main jets [dyno jet I guess]. It ran great, untill I put a pro flow filter/billet adapter on it and threw the lid away. I know I am running lean. My elevation is 800 ft. I think I need a 330 main jet [dyno jet], but I am cheap and will not pay $75 for a DJ kit when I can buy 2 mikuni main jets for $5. What Mikuni main jet size would I need match a 320 or 330 dyno jet? It also used to take 3 to 5 kicks to start it cold, now it takes 20 kicks or so to start it, so i need to get a bigger pilot jet I think. What size Mikuni pilot jet do I need? Thanks to all who reply.

 

u sure they were dyno jets? with pipes u usually run that high with mikuni jets...

 

Ive got 310 main and 35 pilot. Works great. I have the k&n filters though but might be the same flow as your pro flow. Just something to think about. Hope that helps.