90cc is a bit much for most 5 year olds. Unless he's big for his age and advanced in his driving skills, I'd give it a couple more years until you get into 90's.
That said, a decent compromise would be a Suzuki LT80. It can hold it's own with most 90cc ATV's but is scaled down in size. You can also limit throttle in several ways.
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Jaybee
'07 Can-Am Outlander 800 XT - Crutchfield stage I Extremes all around
'02 Eiger 5-speed / mudlites
'02 Ozark
'96 TRX90
Past bikes: '89 Warrior, '97 Warrior, '98 LT80, '94 King Quad 300, '84 LT50
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