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86 through 2002 didn't have the ATAC system Just 1984 ,and 85. They only made 14 HP. In 1986 they done away with the ATAC system, and changed the porting bumping up the HP to 18 making them the most powerful 80 in the line up until Suzuki out did Honda in 89 I believe. Be4 that The KX 80...

THE FIRST ATAC HONDA USED ON THE 80 WAS 1984 THE LAST YEAR HONDA USED THE ATAC ON THE THERE 80'S WAS 1985. THE 1984 HAD A SQUARE HEAD.