Bah, swing arms and suspension? Kids nowadays are to soft.
My older brothers got one like this when I was 5, I ended up inheriting it about 5 years later when they couldn't get it to start (I could).
Briggs 3 1/2 hp.
When I was 14, a neighbor and I decided it would be a good idea to install an early 60's honda superhawk 300cc engine that his dad had laying around in the mini-bike.
We cut the bike in half and welded some brackets and bolted the front half to the front of the engine and likewise the back end.
it had no clutch or brakes, so we push started it and then shifted up and down and shorted the coil and drug our feet to stop.
What could go wrong?
That thing nearly tipped over every time we gave it gas and the gear ratio was all wrong, we could hit nearly 50 mph in 2nd! It did not handle well at that speed.
Luckily we broke the frame so badly we couldn't repair it before the darned thing killed us.