Help - coolant issue
Had some basic service done recently, rear pads and rotors, brake fluid and coolant flushed and replaced.
Bike seems like it has been running a bit hot lately. When I got back from a ride on Sunday I put the bike on the center stand and checked the level, and the reserve tank (left side with the markings) looked bone dry. Today I started adding coolant to the right side of the reserve tank, which is filled almost, but not quite, to the neck. The left side still appears bone dry.
Not being much of a mechanic and referring to the owner's manual, I start the bike in order to get the engine up to normal operating temperature (as per the manual). As the temperature gets close to the little notch on the temp gauge, coolant starts to drain out of the hose at the bottom of the right side, by the center stand. Nothing crazy, just a little bit before I shut the bike off. The left side of the reserve tank continues to appear dry the entire time, and still appears dry now.
Like I said, I'm not much of a mechanic, but WTF? It looks like the reserve tank is a one piece deal, so it really makes no sense to me how one side is full and the other seemingly empty. But even assuming there are actually two parts to the reserve tank, I can't figure out what is going on.
Open to any advice or ideas. Bike is an '04 919, bought last summer with ~22k mikes and it seemed to be in great condition. I have probably put 2k on it since then (very rainy summer in Denver). A few mechanics who have seen it since then all said it looks to be in great shape. Honda branded 50/50 coolant mix was used both for the flush and just now.
Thanks in advance.