Restrictor Plates

Anybody know if the 88 XR600 came stock with an intake restrictor plate? If so, how do you remove it?

My 86 XR600R had a restrictive airbox, I remember cutting out the top and seemed like it had a restrictor plate of some kind. I did the exaust at the same time and rejetted both carbs.

They do not. 88's, 89's, and 90's were some of the hottest stock 600 motors.

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