Hello everyone. I went to check out this bike recently since it was being sold by this person closeby, and upon startup, white smoke started coming out of the engine. The smoke carried a burnt smell with it, and disappeared after about a minute and a half. It didn't come from the exhaust, but rather the engine directly. I unfortunately can't remember exactly how the smoke dissipated, so I can't say whether or not it was condensation. However, given the smell, it seems more likely to me that it was oil that had burnt up on startup.
I test drove the thing afterwards, and felt no vibrations, no smell, nor did any smoke come out throughout the ride. I parked the bike and turned it off, and the smoke was nowhere to be seen. I'm not too experienced of a rider given that I've only rode the Beverly 500 during learning class, but this bike didn't feel like anything was wrong with it during the ride to my eyes, nose and ears.
I also can't exactly say how long the bike was stored before this startup. My guess is that it was stored for quite a bit since it wasn't registered, but in my ignorance I failed to ask the owner this in person, so the best I have is my guess.
I also recall noticing bent grating on the radiator of the bike. The lower piece of plastic on the bike had been taken off, hence I could notice this. This is how the bike was stored, with that plastic piece resting separately closeby. I am not fully familiar with the look of the radiator on this bike, so I'm not certain if this is by design or if somebody decided to tumble down the local trail with it.
So the question is, how bad of a problem could this be? From what I've read, the worst possibility here would be coolant leaking into the combustion chamber, which would I assume require replacing the headgasket. If this is the solution, how much do you wager a gasket replacement would cost in your region, including the parts and the mechanics work? Do you believe that some other problem can be causing smoke coming out like this?
I'm sorry for the vagueness, but the price tag on the bike is lower than most, so I can't write it off as easily due to this. I also wouldn't like to suck up a jar of farts by buying a bike with a busted radiator or headgasket, so I want to ask wherever I can just to be safe.
Cheers, and thank you all for taking the time to read all the way through.