put some injector cleaner and see if it does anything... if that helps, keep using injector cleaning as specified or take injectors out and get in cleaned.
by altering the top perches(perches right under the spring) you can lower it but it alters the dynamics of your damper- short stroke, different drive...
i was just wondering, since the B series runs a dizzy, doesnt the dizzy control the ignition. so no matter what number you put on the ign map in the power fc, it doesnt do anything.
Disclaimer: The following is provided as a GUIDE ONLY, and neither myself nor Ozhonda take any responsibility for the outcomes of someone else doing the following. You follow these steps at your own...
Try cleaning your injectors. i had the same problem as yours.
it will rev normally from 1k and then spluttering between 2-3k rpm then rev normally to redline.
uninstalled my injectors and got it...