My S150 2009 has been running like a dream for years.. recently my Sito Plus exhaust rusted out and I replaced it with another slightly used one.. However, I noticed recently with the old and new exhaust that the bike is having trouble going into neutral when coasting down. It like to stay in gear till im almost stopped, sometimes almost cuts the engine off, and backfires huge flames out the rear.
It feels like its still under vaccum till it finally goes to neutral and idles at a stop. Im wondering if my new used exhaust is the culprit and also clogged up, or if this could be a vaccum line issue? Also now under power, I feel like its struggling to breath when full power. I have checked for a clean intake, clean filter, new clutch spring (small and big), etc.. its either a clogged vaccum line or the exhaust is clogged and isnt alowing backpressure to let the engine breath..
any thoughts or ideas?
btw, my bike is fully modified, 190cc kit, bigger jet, soho cam, etc... not that it should make a diff.. also my evap system is gone for years now.. but again she has been purring like a kitten since the exhaust issues began..