This motor is mounted on a Scout 152 sportfish and I've owned it since early spring of this year. I've run it quite a bit this summer. After purchasing it, I rebuilt the carbs and followed the synchronizing and timing adjustments per the service manual. I removed the VRO and am running premixed at 50:1. It runs fine other than when shifting from neutral to F or R (it tends to stall if you don't throttle up quickly). However, the question I have now is related to a clacking noise I heard the other day when I had to throttle down quickly to avoid an oncoming wake. I was running at 3/4 to full throttle when I brought it back to 1/4 throttle or less in less than 1 second. The noise can be replicated, but I usuallly throttle back gradually and don't get this noise. The noise seems to be coming from the powerhead and not the lower unit and goes away once the boat finally slows down.
Does anyone else experience this noise when throttling back quickly? Is it possible that the prop and shaft may be spinning faster than the engine is being told by the timing advance or does it sound like another more serious problem.
I know how to prevent it (throttle back gradually), but am wondering if it is a sign of something else that may be wrong.
Does anyone else experience this noise when throttling back quickly? Is it possible that the prop and shaft may be spinning faster than the engine is being told by the timing advance or does it sound like another more serious problem.
I know how to prevent it (throttle back gradually), but am wondering if it is a sign of something else that may be wrong.
