hey guys new to the site

so I bought this bike a few months ago
I was told it had sat for a little so I did full tune up

now my problem that after riding for about ten minutes or so I go to give it gas and it just boggs down and If I stay in the throttle it will back fire and blow the carb off

I have tried adjusting the carb to ever setting possible
I have also done and new timeing chain and check the valves all is good in there

it only seems to do it when Ive ridden it for about ten mins.
the only thing that I have not fixed is my oil cooling fan does not come one idk if that could cause it?

I have dumped a ton of money into this bike and I have yet to be able to take it for a ride

any help would be wonderful

heres a picture of the bike