Already solved it (I think) but I figured I'd let y'all know what happened and what I found.

I was supposed to meet a friend for dinner. The restaurant is on South St here in Philly, a popular party / be seen street. So I figured I'd ride there and... well, be seen . Yesterday, however had to be in the 90s. And I, quite stupidly, decided to ride down all 38 blocks of South St instead of taking I-95 and riding a couple blocks to the restaurant. So approximately 30 blocks of < 20 mph riding, with the last 14 blocks < 10 mph.... in my gear too. Bike hit 233 degrees by the time I got to the restaurant (maybe 10 degrees hotter than me in my jacket).

When I got to the restaurant, my buddy was waiting out front. And the first thing he said is "You're leaking coolant". Sure enough, a pretty good stream of coolant spilling out as I parked. Since I didn't go above 233 degrees (and was in dire need of a beer), I wasn't significantly worried. I checked the reserve bottle, saw there was coolant in there and went inside for the beer (just 1 during the 1 1/2 hour dinner). Came out, rode home (taking I-95 this time instead of going local). Ride home, never got above 220 with 185 at freeway speeds.

This morning I go out to see what I can find. And this is what I find

If you look closely, the coolant siphon hose is barely on the radiator. The lock ring is definitely not over the hump that's supposed to lock down the hose. I figure as the temp climbed, the pressure forced coolant out the hose around the nozzle. Without a good seal instead of maintaining a vacuum, it became a path of least resistance for the coolant.

Gonna get a better locking ring (I hate those pinch type), top off the radiator / reserve and burp the system to make sure there's no air in it. See what happens from there

 

With any luck, you didn't lose more than your coolant reserve had. That'd even save
you a burb. ;-) Personally, I prefer the screw-band clamps for everything. More secure
and generally easier to manipulate. Hope it all works out...*fingers crossed for you*....

By the way, thought occured to me, there shouldn't be any pressure on that line. If it's the over-flow to the reservoir, it should basically be atmosperic (+/- for the siphon effect). If it was "pushing' on it, ther may be a blockage or kink. Something to think about, if I'm reading it right. ;-)

Ern

 

Shouldn't be any kinks in the hoses. Haven't been under the fairings since... never

You gonna make me flush the radiator aren't you?