I have never had the bottom end of one of these apart. Now, I may get the chance.
My college son called and said that the motor had stopped running while on a trail ride. It would still kick, according to him, but wouldn't re-start.
I am going over the list of possibilities in my head, and I am thinking fuel related, like a fuel pump.
I get the bike home, three months later, and it won't kick. Locked up solidly.
I go to drain the oil, so that I can look for metal. No oil came out. Heart attack and stroke simultaneously.
I take out the oil filter, spread it out, and no metal particles. I fill engine oil and drain it, just using it as a rinsing agent. No metal particles. Refilled engine and trans oil, install new filter, lay the bike down on each side to slosh around the oil. Poured oil in the top and coated the cam and all of the parts there.
Now, I will try to rock it back and forth in gear and see if I can unlock it.
So, the question is-with a lubrication deficit, what would seize first? Piston in the cylinder? That I can fix. Crank bearings? Above my pay grade so far, maybe I will get a great winter project on my hands.
Any chance that a piston hot seized and locked up the motor before the rest of it grenaded? Help me feel better about the prospect.