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Old 02-08-2021, 05:28 PM   #41
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I ended up going with Mercury manifold and elbow. I'll check the gap on all of the plugs. Thanks!
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Old 03-25-2021, 12:30 AM   #42
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Just updating this thread. The new manifold and riser resolved the hydrolock issue and even better got my boat running strong again. I have another thread I'll update in a bit, where I couldn't get my boat on plane. That's not an issue any longer. I bought this boat knowing it had an engine issue and got a big discount because of it. Big enough to replace the engine if needed. Luckily it was a cracked manifold this whole time. Thanks for all the help.
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Old 03-31-2021, 03:13 PM   #43
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Did you just do one side? They are usually swapped out in pairs.
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Old 03-31-2021, 03:29 PM   #44
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I only did one side since this is a freshwater boat. I'm thinking that this manifold froze at some point. It's on the opposite side of the heater and the heater is pretty weak. I've purchased a new heater and I'm going to try to rebuild the old heater to have as a backup. I do think that I'll do the other side next season. I mentioned that my boat is running strong again, but I'm not sure if it's running perfect. I'm hitting between 35-36mph. I think this boat is supposed to get around 39, but it is almost 20 years old.
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