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Posted by Jake Morales
- May 25, 2015, 22:30:47 PMI just traded a 2003 Buell Xb9r for a Vulcan 800 Drifter of the same year with 21,000 less miles 
but it has some issues. When I started it up, it was shooting out black smoke and smelled rich and it sputtered at low RPMs. I took off the air filter and can see the slide and butterfly valve bouncing just off idle. I removed the EGR valve and plugged up the hoses. I ended up screwing the pilot screw all the way in and it still shot out a little smoke but it didnt smell rich, but the slide still bounced up and down at the lower RPMs. If i pull the throttle and modulate the slide with my finger, it runs smooth through the RPMs. I removed the carb and checked the diaphragm and floats and needle and everything seems fine. I'm completely stumped. Could the exhaust baffle be clogged and causing too much back pressure? The bike is completely stock. No aftermarket filter and no aftermarket pipes. As soon as it gets passed the low RPMs it runs good. Somebody please help! I love this bike. I NEVER see these around anywhere and I want it to run right!