GSX750ES new exhaust (4 into 1), tickover problems

[expat2000]

Winter work is progressing in my frozen garage.

Just fitted a 4 into 1 exhaust, headers and collector from an early GSXR11 (allegedly, seller wasn't too sure), home made link pipe and a cheap generic end can.

Repaired a snapped exahsut stud and replaced gaskets.

Starts and runs fine but seems to struggle with tickover, tried adjusting tickover screw and seems to be fine for around a minute (around 1500rpm) then just drops to 1k and dies.

Is this a "feature" of going to a 4 into 1 or should I be planning to change jets, adjust settings?

It ran and ticked over perfectly before, previously had the original exhausts that had been gutted and rewelded.

Havent changed the inlet setup of cheap pod filters as it was running so well before.

Any advice?

Cheers

 

[Pudzrx]

Blocked silencer on the new system ?