I eat my R6
Join Date: Dec 2014
Location: Southwest Ohio
Bike: 2008 Yamaha YZF-R6s Stock
Re: coolant leak???
Yours could be a little different, but if you trace the coolant lines running from the back of the radiator just below the radiator fill cap, over to what resembles an electric motor on top of the throttle body, look for leakage there. It may simply be running down the TB. I believe that's the only coolant connection "to" the TB assembly. I'll want to double-check, but don't recall any coolant lines running directly into the TB assembly itself. Disconnecting it is just pulling the fuel, throttle cable and wire harnesses. That's an "auto choke" setup, responsible for closing off airflow as the coolant temperature increases. (most modern automobile gasoline engines handle this electronically instead of mechanically - ECU reads ECT and adjust IAC motor/solenoid)
There may be another line running over the top of the transmission, that connects the coolant reservoir with the radiator.