Grand Prix 500
Main Motorcycle: Street Triple R
Join Date: May 2012
Location: Northeast US
Other Motorcycle: 2010 Tiger 1050
Extra Motorcycle: HD Road King
I had a problem with my 1050 Tiger. It only leaked when the bike was turned off when hot. I was the radiator cap. I could see that the rubber seal had deformed, probably from sitting without use for an extended period. Also, make sure that there isn't any rough spots or debris where the rubber gasket seals in the radiator housing. You can feel this with your finger. The cap they replaced my original with had a different label from the original and appeared to have a slightly thicker rubber gasket, but it has worked with no problems since. I would try another cap first, particularly since it worked for a while with the replaced cap. I understand that it is a standard size for many motorcycles.