A succession of NZ road and beach records followed. In February 1957 he set a NZ Open Beach record of 131.38 mph, raising this in 1975 to 136 mph at Oreti Beach. In April 1957 he set a 75Occ Road Record at Christchurch at 143.59 mph. In March 1962 he covered the standing 1/4 mile at Invercargill in 12.31 seconds.
Burt, then a grandfather, visited the Bonneville salt flats several times from 1962 onwards. In that year he set a then world record of 178.971 mph with his engine out to 51 cu.in. (85Occ). In 1963 a con-rod broke while he was traveling at an estimated 195mph. In 1966 it was displacing 920cc, when Burt, unhappy with some loss in top speed, completely rebuilt it again.
In 1967, with his engine punched out to 58 cu.in. (950cc) he set a class record of 183.586 mph. To qualify he made a one-way run of 190.07 mph, the fastest ever officially recorded speed on an Indian.
His visits to the salt were not without incident. In issue no. 1 of Motorcycle New Zealand, published in 1973 Burt is quoted as follows:-"At the Salt in 1967 we were going like a bomb. Then she got the wobbles just over half way through the run. To slow her down I sat up. The wind tore my goggles off and the blast forced my eyeballs back into my head - couldn't see a thing. We were so far off the black line that we missed a steel marker stake by inches. I put her down - a few scratches all round but nothing much else". At the time Burt was traveling at close to 206 mph!
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