Are banshees arent worth much. U got real buyers here who will clown on a guy for asking to much and say his bike is worth 2k where hes from.
Now ur tryin to say they are worth it? Well then u go buy a stock bike with fmfs for 5k then. Be my guest.
If u want violence dont get a serval. There smoother in the powerband and flatter on top. If u know how to ride a doggy bottom end and want violence, cub all the way. Fuel is up to u but running temps is a factor.
Oh and i have rode a 421 cub on pump with a cleanup port, lockup, and dunable overide. It had 135 psi in each hole. And it felt just fine. Good bottom for a cub imo. No its not snappy off bottom but its fast if u know how to ride!
Im actually gonna try a 10 cub on pump gas. I dont care about having doggy bottom end. Im used to it on my pump gas 350 drag ported that i dune. That thing is doggy in the deep sand on bottom. And i ride it no problem. I love the light switch feel. We ride banshees remember. Im sure your 421 and definetly my 465 on pump will have more bottom end torque them a 350 dragported on pump. I just want a fast duner. And the serval is not for me. I have rode one!
Only thing i can think of is one side not getting enough fuel(clogged pilot). Or coil is not firing even. I know u said u switched them out but id cut the ends and get a fresh connection at the coil to wires. Could have spark but weak on one side.
Take them off and clean everything real good. Then use some gray or black rtv On all surfaces. Just a thin thin layer with ur finger so u dont get any squished out. Let dry for a day. DONE!!