tuning question 86FVR750F

I am the recent proud new owner of a 86 interceptor
I just got done replacing the stator/alternator,rectifier,clutch,
air filter(K&N or coarse) ,adjusted the valves,new plugs(NGK)

my question is before doing this there was no flat spots in the powerband .........
when buying it the guy said something about mabey being jetted wrong for my area of the country

I also have kerker header on it ...........

I have a flat spot around 5-6thousand RPM wile driving then takes off like no tomorrow ,,,,,,,,

I can cure it by driving in olny first and second around town

does this sound like jetting issue ?????????
or just to keep the RPMs up

thanks for any help !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

First off...congrats and welcome to the board.

As far as the jetting issue, I am not sure. If it is a jetting issue then I have it as well, just figured it was where the powerband kicked in. I dunno, anyone with a bit more mechanical background know if there is an inherent flat spot in the 86?

Try sync'n them first. Come to the conclusion any bike is gonna have a flat spot. More of a factor of raing or lowering it, then smoothing it through.
(With the exhaust and filter, you may need to)....

Re-jet, that is.

sorry it is more of a hesatation than a flat spot...........
and just found fuel coming from overflow tube =-(

was just try to avoid working on the carbs .............

thanks for your help guys !

If it's coming from the fuel petcock assemply under the tank then your gasket that has the 4 holes in it that is used to select from reserve, off and on position will need changing. If it's coming from the carbs needle and seats will need replacing or trying to adjust the floats in the carb, but more that likely you will have to replace something. I had a bad gasket in my fuel petcock and it caused all the gas to leak into my engine, plus when it was running the cylinder which runs the vacume was really rich cause of the extra fuel it was sucking down the vacume line.

I replaced the fuel petcock
I found it was bad by still driving with fuel turned off ............