Runing lean ?
 

After fitting 45mm Termis slip ons & ICU (996R) on my 998 a while ago i asked my dealer to check the C02 on the Matheis , when it came back he said they richened it up a bit
Since then i have done around 2 thousand miles with no problems , but there is still no soot around the End cans & the bike still pops a bit on the overun which to me seems like its a bit lean !
I know the delaer said that it should run at 1.5% as per manual but i told him to set it for the pipes !

Any thoughts !