If you are thinking about taking the machine to the streets however, you may want to read your state's traffic laws regarding correct speed and driver license type. (myimprov.com)
If your engine is running at correct speeds I'd be tempted to look at the airflow path and see if a hose is running along a radiator or resting on one of the hotter bits of the engine. (mechanics.stackexchange.com)
New digital transfer, digitally remastered at the visually correct speed by preservationist David Shepard (criterion.com)