Finally, the engine is ready to go !!

Here are the probpems I found. I took the engine apart, and found the rear bearing is all rusty. It is really nasty. So, it took me a while to clean it up really good. Other than that, The small o ring in the MC carb has been wear out which has cause the leaks and that is why I can not locate the true "no fuel" point. I also replace the perry pump which comes with the engine with my as new one. The pressure tube has been replaced with the original one. Two head shims have been added into the engine as you suggested. I use OS F plug and cool power 15%.

Engine starts out right away. It took me about 2-3 hours to tune the whole throttle curve.
The weather is getting colder and I believe it still needs to be fine tune a bit.
Anyway. This is a good lesson learn experience for me. These info. might be useful for the webra MC carb. begining user.

Thank you all again.

Mike