Hello Everyone,

I have a 2008 KTM SuperDuke with a MotoHooligan Airbox, GPR exhaust,and a PCV installed which was dyno tuned. My bike backfires on down shifts and sometimes on hard acceleration upshifts but not as laud. The shop I went to for the Dyno tuned indicated that this was normal. Can anyone tell me if this is normal

Cheers,
Peter

Not unheard of at all. SAS can cause this. If it's turned off and/or blocked it might just be a slightly rich tune.