if i'm driving it around, it doesn't smoke, as soon as it has time to sit and idle for bit, you can see it in the exhaust starting to build up. rev it out a few times, and it seems to clear up for a bit, then comes right back again. but its only at idle when sitting for a couple of minutes or so. driving it, no smoke. everyone that drives behind me on the trail tells me it smells like raw fuel.