The top speed of a STOCK doodlebug DB30 will range on your weight and riding conditions. People between 150-180lbs have reported averaging about 21MPH top speed with a doodlebug.
You can add a new, larger rear sprocket to gain more top speed from it. You can also upgrade the motor fairly easily to a 6.5 HP.
You can loosen the governor whitch is located inside the engine.
No, He Is Not
A Volkswagen bug's real name is a Volkswagen Beetle. I have never heard of a doodle bug.
I added a link to a doodlebug website that will help with getting the most out of your doodlebug db30
No, they were German not Japanese.
tubeless
Monster Scooter Parts has several tires available for the 97cc Baja Doodle Bug: http://www.monsterscooterparts.com/badbscpa.html
42mph
The dollar store
30w
The vw beetle top speed of 78mph 98mph down a hill
most 4 stroke