Well guys its happened to me now , the by pass hose cap blew, this is the one located on the upper right side behind and under the shifter cables, it made a real mess of the dash as the steam flowed up thur and around it. my Stallion a 09 with about 7K miles on it. so its not the milage but the age. its not easy to see the cap maybe only 3/4 of an inch high with a hose clamp on it the complete top of mine came off ! i limped in to the Advance Auto parts store about 20 miles after stoping twice to add coolant ( water that i had in a cooler ) and bought a box of caps assorted sizes i beleve its was about $8.00 and the store mgr. even put it on for me , now i have to find the one at the rear of the trike and change it before it goes also, i know someone had wrote about that one earlier but i dont remimber where it was left side right side ? if i had to do it over and was at home or at a shop i would use 5/8 reinforced heater hose maybe 4-6 inches long and a 5/8 stainless steel bolt to cap it off with just my 2 cent.....