I noticed I was getting a little smoke from the exhaust during cold starts, accelerating from a stop while engine was still cool, and during deceleration. One engine had warmed up the smoke issue was gone (or not apparent). I was pretty certain it was oil not coolant, and my hunch was valve seals as opposed to cylinder rings as the culprit. I replaced them a weekend ago (only the right intake seals, as the right spark plug was fouled up significantly, left seemed fine).
After replacing them, I started the bike up, and it started up fine, with no smoking. Let it heat up so the fan cycled on and off twice, it stayed good, and I called it a day. But this week I started it up two separate times, and got significant smoking on startup and deceleration. Video in link below.
My suspicion is I messed up the seal replacement, since it's got the same symptoms but more severe. How can I tell if I've properly seated the valve seals? They slipped on easily enough, but when they reached the base of the valve guide, I didn't feel it click or snap in place or anything. I had applied a good amount of force and didn't want to push too hard, but maybe that was my error.
Planning to take apart on Monday to inspect, but any feedback going in would be appreciated!
Added: I know the muffler isn't supposed to be smoking from both ends. Someone was so kind as to tip over my motorcycle, so the exhaust an brake pedal need some work. But I am pretty sure the tip over is irrelevant to the smoking issue.