I see you found the master link and got the chain off so I won't say anything about that except the "elbow" of the master link clip should be pointed toward the direction of chain travel when you reinstall.
Mike,
The ramp lift is simple, the only modification I will do next time is secure the ramp board to the horizontal board to prevent the ramp from exiting backward when accelerating. I will use some sort of pins or something.
As for the tires, they are the Dunlop K70 knock-off 3.50X19 Cheng Shins our host sells. I put the 3.50s on both the front and rear. I really like the look, and they grip much better than the worn out Avons that they replaced. The old avons were very old and starting to crack, and apparently, when tires get that old they grip very little. I was a bit surprised at how sticky the Cheng Shins are, but again, that may because old tires had nearly crystalized and lost grip over time.