Munro was born in 1899 in Invercargill. Munro's interest in speed began at an early age, riding the family's fastest horse across the farm, despite the complaints of his father.
Munro quickly rose to the top of the New Zealand motorcycle scene, racing on Oreti Beach and later in Melbourne, Australia.
Munro's Indian Scout was very early off the production line, being only the 627th Scout to leave the American factory. The bike had an original top speed of 55 mph (89 km/h). But this did not satisfy Munro, so in 1926 he decided to start modifying his beloved Indian.
The biggest two challenges for Munro to overcome while modifying his bike were his lack of money and the fact that he worked full-time as a motorcycle salesman. He would often work overnight on his bikes (he had a 1936 Velocette MSS as well), then he would go to work in the morning, having had no sleep the night before.
Because Munro was a man of modest means, he would often make parts and tools himself instead of having them professionally built. For example, he would cast parts in old tins, make his own barrels, pistons, flywheels, etc. His micrometer was an old spoke.
In its final stages, the Indian's displacement was 950 cc (as built it was 600 cc) and was driven by a triple chain drive system.
Munro travelled to Bonneville ten times, the first time for "sightseeing" purposes. In the nine times he raced at Bonneville, Munro set three world records: first in 1962, again in 1966, and once more in 1967. He also once qualified at over 200 mph (320 km/h), but that was an unofficial run and was not counted.
Following the misspelling of his name in an American motorcycling magazine in 1957, Bert Munro changed his name to Burt.
- In 1962, he set a 883 cc (53.9 cubic inches) class record of 288 km/h (178.95 mph) with his engine bored out to 850 cc (52 cubic inches).
- In 1966, he set a 1,000 cc (61 cubic inches) class record of 270.476 km/h (168.066 mph) with his engine punched out to 920 cc (56 cubic inches).
- In 1967, his engine was bored out to 950 cc (58 cubic inches) and he set an under 1,000 cc (61 cubic inches) class record of 295.453 km/h (183.586 mph). To qualify he made a one-way run of 305.89 km/h (190.07 mph), the fastest-ever officially-recorded speed on an Indian. The unofficial speed record (officially timed) is 331 km/h (205.67 mph) for a flying mile.
- In 2006, he was inducted into the AMAMotorcycle Hall of Fame.
- In 2014, 36 years after his death, he was retroactively awarded a 1967 record of 296.2593 km/h (184.087 mph) after his son John noticed a calculation error by AMA at that time.