whats the book value on a 1991 kawasokie ke 100 street and trail bike worth?

Answer 1

1991 Kawasaki KE 100
Trade in value - $495
Retail at a dealer - $860
Usually you can get a price right in the middle if you're lookin to sell.

Answer 2

Sell it yourself.
You can get between 350-500 bucks.
If the tires, seat and chain are junk, you will get less.
Make sure the bike is clean, has fresh oil, gas, plug and air filter.
Hopefully it runs.

I bought mine for $95.00 at a garage sale.