What size main jet

[CrypticZz]

So I got done rebuilding my 2000 banshee and I’ve run into a slight problem. When getting into higher rpm’s like in 3rd gear and up my bike bogs. It has great power if you shift just right in third but going into 4th it just gets to the point where it doesn’t gain any speed from giving it gas and it just goes at a consistent speed with absolutely no gain unless I downshift I to the previous gear powerband, rev the crap out of it, then shift up so it finally gets on the pipe and gets going again. I’m thinking this is the main jet so what size should I get for my bike. The parts are as listed:

Athena 68mm cylinders with no port job

toomey t5 pipes and silencers 

A stock airbox with no lid 

21cc domes and pro design cool head

 

Hoping that can tell me what size main jet I need or if it’s another jet that I’m missing. All input and answers are appreciated