Jetting for a Hindle exhaust

[KGB]

I’ve installed a full Hindle exhaust on a 1980 GS1000S
stock air box and carbs.
it stumbles until about 4K rpm then runs like a banshee
At times when warm it wants to stay at about 2500-3000 rpm at idle
When cold, like right at startup it idles fine
The choke is not sticking
the carbs were recently rebuilt with all new o-rings

anyone use a Hindle and what jets did you use?
im looking for a baseline. This is a street bike, not a track bike

thanks

[Nessism]

Where are the pilot screws set and did you perform a vacuum sync?

[tom203]

Of course you used new carb boot o-rings ...

[rphillips]

Just bolting on a pipe shouldn't affect anything at 0 to 4K rpm., & very very little above 4K. Like they said, probably look at something other than the pipe.

[KGB]

yes All new o-rings new rubber manifolds

[Nessism]

You forget to tell us how many turns open on the pilot screws and if you performed a vacuum sync.