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Message: <blockquote data-quote="Charger25" data-source="post: 281534" data-attributes="member: 9620">I don't think that a little exhaust will starve the engine as bad as what you're saying. If the exhaust gasket is leaking you should see some smoke around the block when pulling the cover off. What I'm getting at is one of my 25's needs a new exhaust gasket and when the cowl is removed when running there is oil smoke under the cover,but it will still run fairly well for an abused motor. The only time I had to put louvers on a cowling was on a 200 merc when I had to swap power heads. If all the mechanic did was work on the carb, then maybe he didn't hook up the linkage correctly and the cover is some how keeping you from achieving WOT.  Try marking throttle position on the tiller handle at WOT with cover on and then off and see if there is a difference.</blockquote>