I just bought a 95 M900 that had a custom exhaust (coming up under the seat) with Two Brother slip-ons. I changed the slip on's to a set of Leo Vinci's I had, but I'm running really rich now - some fuel comes into the airbox. I've never messed with a carburetor before, but in tearing this one apart the only difference from stock is the main jet is 175 (stock is 140). I was thinking of getting a Dyno Jet Stage 2 kit (K&N filter also) but am curious what knowledge might be out there already.