The '99 has a very small hole in the starter jet. If it were to clog then I would think it would be very hard to start cold. Mine starts right up even down to 25, cranks a little slow at that temperature but starts.
You stated that it seems flooded. Is there a lot of black smoke when it finally starts? The accelerator pump at the stock setting shoots a pretty good stream of gas.
yes! this is exactly what my bike does. Starting it cold and no choke is terrible. It backfires through the carb
, feels like it floods itself and there is a good amount of black smoke. But once I ride it for a good while (more than an hour) it seems totally fine with starting. Bike seems like it takes FOREVER to warm up though, it has the same starting issues if I ride for 30 mins, get off for 10 or 20 minutes, then try to ride again.
Also, it seems like it floods itself really easy when it's cold. If I'm cruising and I open the throttle up hard while its cold, it will sputter a few strokes and then wake up. If it's warm, then the power response is immediate with zero sputtering.
One last thing, as I think it might be related: Whenever I stop really hard, the engine dies. I've tried with bike cold and hot, and it doesn't make a difference. I have no idea what to think of that.