Engine stumbling suzuki bandit 250

[fullhouse]

Hi
New here hope to find some help with a problem that i came across

bike i have 250 Bandit gsf has slip on and prevois owner added bigger jets

since i have had the bike once the bike warms up and i get to town i have a problem taking off from a traffic light or anywhere where i need to stop.
Once i take off from a complete stop the bike has no power takes like 2-3 sec for it to kick in once i get response all the gears right through the rpm range the bike goes well.
so only have the problem when taking off.
things i have done/checked.
added fuel filter
checked petcock
cleaned the carbs
and checked that all needles are clear
turning up the rpm on idle doesnt work.
have noticed the clutch is not as strong as it use to be not sure if that can cause it just a idea maybe.
check spark plugs slightly black
new carb boots and clamps previously it was leaking

any help is very appreciated

[FJRider]

Have you checked your air filter .. ??? it has to breathe.

Why did the previous owner fit larger jets .. ??? With no mods to the air intake ... it would make it worse not better .. ???

And check plug spark colour not plug colour ...

[fullhouse]

has new air filter
not sure why the previous owner added bigger jets
spark plug tip is slightly black unscrewed it and checked

[jellywrestler]

has new air filter
not sure why the previous owner added bigger jets
spark plug tip is slightly black unscrewed it and checked

can't see the piccies of the plugs, try reposting them

[Ginge09]

When you say it has no power when pulling away, do you mean it revs but it won’t drive ( which would be clutch slip) or it fails to rev cleanly and won’t produce power ( which would be carb maybe)

Added fuel filter... may be too restrictive?