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4040, 4041 and 9020

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The first member of the family was the 4040 manufactured in 1972. The next year the 4041 came out with the 19.5 (20) hp engine. It was the same block, bore and stroke but had a different carbureation and intake manifold generating the increased horsepower. Again one year later the 9020 came out - 1974 now - with only cosmetic changes. It continued to be marketed into the early '80s. Steve

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