Thanks for all the great info. I will let you know how we do. Hope to tinker with it next weekend.

Thanks, I think the goal is to get it running and play with it a bit to see if he likes it before sinking too much money in it.
What kind of speed do these have?

Just picked this up for my son.
Any way of dating it?

There's a number on the engine 120081 and on the front of the frame 6157321.

We're new to these, so any help/advice would be appreciated.