Hi guys, I got another bgf engine to stop working. I was riding yesterday and the motor began to sputter and I could hear something like bouncing around the engine as this was all happening and then finally the engine just stopped and would not start again. Luckily I was able to still pedal home a short distance. I was running a 41 tooth sprocket on an 80 cc bgf engine and thats the second engine that this happens to on this bike. This one lasted about three months and the one before lasted 2 weeks. I believe I was going about 30 when it happened. I got the bike home and took off the head. I walked the bike around to see what would happen when i released the clutch and the piston will not move. The motor will not turn but I can still get it to free wheel to where I can pedal but when I release the clutch it completely locks and wont turn at all. Can some one tell me if it's a goner