HIgh Rpm bog?? need quick replys please

[300excrazy98]

High RPM Bog... Help me please also CR250 Ignition?
Hey guys my 295r has a bad bog in the high rpms... I cant go full throttle, but it doesnt stall when i do it just bogs down... I was thinking the jets..

Its got

295 bored out
duncan mx porting
hot rods crank
cases are machined out for a 340
keilhn carb 39mm??
some sort of alum. exhaust flange
bills header
lrd silencer
boysen rad valve


I was thinking that it was getting to much gas.. bc when i took the plug out it wasnt that oilly but had some gas on it.. so i thought back to when i bought it from the guy, and he said he had a 340 on it, so i doubt he changed the jets out of the carb.

Which jets would i need to change? would they need to be bigger or smaller? any sizes?

Also on the jets does it say what size they are?

[cals400ex]

from how it sounds you are too big on the mainjet for sure. its hard telling with the rest of your jetting though. that could be off as well. it will say the size right on the jet.