Just made this great wheelie.. did you see it?!
Join Date: Mar 2018
Bike: 2008 yamaha R6
Cant Find Coolant leak Origin
Here's the situation, last summer I replaced the entire water pump due to a major coolant leak coming from the weep hole. Bought a brand new one, slapped it in, and everything was fine for the rest of the summer. Come the end of the season, I parked the bike in my unheated storage unit where it sat for about two months before being used again on a rather warm winter day. When I was pulling the bike out, I noticed a palm size puddle of coolant directly beneath where the exhaust header bends. I started the bike up, no leaks while running, and no signs of leakage from anywhere whatsoever. Rode it around for a day and everything worked fine, still no signs of leakage while running. Parked the bike back in the storage unit for about another month before I went to pull it out again for another ride. Same situation, palm size puddle of coolant under the bike. This time I tried to see where it was coming from, took off the right side fairing and checked all the hoses. Everything seemed fine, I even went around and tightened some of the accessible hose clamps just to be safe. Rode it around for a few hours, still no leaks, parked it when i was done, came back about 2 weeks later, and once again....more coolant under the bike. I took it into a shop but they said they weren't able to replicate the problem, just did the same things I already did, tighten the easily accessible hose clamps.
As of this point, I believe the leak is coming from either a loose or cracked hose that is behind the exhaust header which is very hard to get at without complete disassembly of the exhaust, which neither I nor the shop has done. I also have a theory that maybe the issue has something to do with the bike being in an unheated storage unit, therefore causing some of the rubber hoses to contract and become loose? I live in the Midwest and the temperatures this winter were well below zero for weeks on end. I kind of want some input as to what I should do next. Thanks!