Unless the radiator is really low I'd ride the bike and let it suck coolant from the overflow tank. If it's low when cold I wouldn't fill it to the neck. That's what I did with a car and it worked fine. I jus topped of the overflow tank as needed to get back in "spec".The overflow tank was "full" of coolant so now my question is - once I refill the radiator to the top of the filler neck do I need to siphon out the overflow tank to bring it's level back into spec?
That's how it should work. I don't know where the expelled coolant ends up besides on the ground eventually. Does it blow back onto the underside of the bike? Does it hit the rear tire? Drip inside the plastic somewhere? Any of that might be a downside.smunderdog said:I would assume it would just eventually blow out of the overflow tube attached to the tank...so is that the only downside to not siphoning it?
After filling the radiator I'd take some quick short rides to get the temp up and maybe get the fan to kick in then check the overflow reservoir. I'd prefer to siphon the excess as needed instead of having end up on the bike.