Brewman said:
You can't tell until after you've owned it long enough to find out the hard way. Unless the prior owner knows and is willing to disclose it.
well that certainly drops the value of the used Burgman. For me, if there isn't at least $1000-$1500 margin between new and used for equivalent scooters, I might as well go with new. Which means, with a potential $2000 repair lurking in the background, that means a use Burgman would be worth $2800 to $2300.
Ouch.
It would be wise than to develop a test so that those who have scooters in good repair can get the value they deserve. And those with the problem, can deal with Suzuki.
From the descriptions of the problem, it sounds like there's a pressure differential between the engine and the transmission further complicated with a difference in viscosity between engine and transmission oils. With more pressure on the engine side, the fluid is forced into the transmission leading to the overflow. So that raises the question, what is that pressure differential and can we come up with a nondestructive test to detect the leak?
One simple test, again based on other people's descriptions, would be to open up the transmission "level hole?" and see if any oil drips out. If it does, that's apparently a clear indication of the problem. Second more invasive test would be to pressurize the engine oil compartment and see if there's an uptick in pressure in the transmission oil compartment. Additionally, one could just watch to see if pressure drops on the engine side over some period of time.
big question here on the second test would be how much pressure does it take to break the seal because it wouldn't do to damage someone's bike.
just thinking out loud, hoping to cover my ass in case I buy a used Bergman one of these days.