I recently bought a Honda 10 hp on a 14' Mirrocraft. I was told it was a 1991, blue paint, yellow propeller, grey engine. Block has (197 cm3) B100S1600430 stamped on it.<br /><br /> First time out it was slow, RPM's stopped about a 1/4" past the start position so I still had 3/4 to 1 inch of throttle. Linkage was fine it just won't rev. Took the carb off and cleaned it, wasn't very dirty when it was removed. Put it back on and ran it in a 55 gallon drum while on the boat and it ran great in all throttle position. Plugs were put in last year and it idles fine and runs fine.<br /> <br /> Back out a second time and it was slow! I was told being a four stroke it should be like a 7.5 two stroke, this is running like a 2 or 3 hp. It just can't get the RPM's up. And this is a fairly light boat, no decks all aluminum. <br /> Timing belt? <br /><br />