Here's an update:
It is a 1966 Thunderbird Jr. GoKart built by Powercar Company in Mystic, Conn.
It was built in late 1966 according to the 4k serial number and was available in Gas and Electric versions. They were very expensive for that time and were built in small numbers. Production stopped in early '67
There is a electric version in yellow right now on ebay for $2900.00 so apparently this thing is fairly collectable and quite rare. Less than 5 thousand bodies were ever made and many were destroyed by inexperienced drivers, so finding an original survivor in such excellent shape was a real lucky break! *Does a happy dance*
Some were used by Ford dealers to promote the T-birds and some were given away in various promotions.
It looks all original compared to the pictures I've seen, so it looks like I scored a rare original toy!
I can't wait to get it running. The bigger 5hp briggs (originally a 2.5 hp)will fit perfectly under the body with a carb and manifold change and the belt lines up straight!
I'm currently freeing and lubricating everything and replacing the rear tires. Fitting the flathead and checking the belt then dissasembling for lubrication.
Then it's on to drilling and mounting the flattie and testing it!!
Heres a link to some info
http://www.jrcentral.com/thunderbird.html
Here are some more pics from today.
Notice how the belt tightens to engage the drivetrain...very unique!
I'll be fooling with this thing until I get it running again so stay tuned for more cool pictures of my fiddling.