New bucket for the 50cc? If it came with a piston (with rings installed) and head, you are so set. 2-4 hours all up - easy. No cam chain to deal with, and because it is so small you can use your hand to compress the piston rings! LOL!
Few items:
- Cross torque the head bolts when reassembling to prevent warping (just like you would on a 4 lug tire)
- USE A TORQUE WRENCH!!!!
- if you are upping displacement (50-70cc), you WILL need to at least rejet the carb. You may even need a bigger carb. Good News - It WILL be faster
- For the first few tanks, add a little extra 2 stroke oil to the premix for breakin - Run the carb a lil rich too.
If you need help or words of encouragement we're right here