running problems

i have a typh gilly l/c with a mhr rep 70, super 9 vars 3g rollers, enki reed valve, tnt 21mm carb .85 jet, athena platinum belt, leo vince tt , tgb clutch bell red springs and yellow contra spring

basically it has out of the blue stopped running properly it has been fine for the month ive had it
it starts fine idles ok and as soon as you twist the throttle AT ALL it bogs and cuts out
ive explored the possibility of air leak around the reeds, taken the air filter off to see if it had enough air but its fine as i say it was running 100% up till last night
any thoughts please help

that pipe is not good enough for a Mhr rep.... Is it jetted correctly ?

i know the pipe is stranglng it it came with the bike a c16 is next on my list and it seemed to be but i spose im gonna have to change it n see

what dyou rekon up-jet it or down???