Recent content by impy03

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    Incorrect spark plug gap cause loss of RPMs at WOT?

    I did run the boat immediately after cleaning the hull and that was before I was able to replace the harmonic balancer that failed. I had the same or very similar results and I could tell that my port engine still seemed to run a few hundred RPMs faster (mid to upper 3000 RPM range) than my...
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    Incorrect spark plug gap cause loss of RPMs at WOT?

    My apologies, I did dive and take a stiff brush to the hull which removed the majority of the growth. That is why I say it is just a light layer of slime now as I did that about 3 weeks ago and a small amount has returned.
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    Incorrect spark plug gap cause loss of RPMs at WOT?

    No muscles in my area that I have seen. The bottom is a bit slimy but it is a very light layer that is easily rubbed off. Seems like my port engine is now running consistently around 3600-3800 RPMs WOT and my starboard engine is staying around 3200-3300 RPM WOT per my tachs. I feel that my port...
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    Incorrect spark plug gap cause loss of RPMs at WOT?

    Yes and yes. That was replaced last season and I have double-checked all wire connections and the firing order for my starboard engine several times.
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    Incorrect spark plug gap cause loss of RPMs at WOT?

    So I got the new harmonic balancer installed and it definitely helped the smoothness of the idle, but no change in RPMs on that motor. Checked the timing and it is in spec according to the spark arrestor cover. I checked the hull and I do have a very thin layer of light slimy marine growth, but...
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    Incorrect spark plug gap cause loss of RPMs at WOT?

    Been a while since an update, but it has been determined that the harmonic balancer is failing on one engine, which I would assume would cause some timing issues. I have a new one on order and will update again once I get it installed and get the engine timed correctly. I also went ahead and...
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    Incorrect spark plug gap cause loss of RPMs at WOT?

    Just to conserve writing a book, I'll say I appreciate all the help to everyone and I'll just plan to stick with checking the hull, fuel lines, anti-syphon vales, and doing another compression check. I'll report back once all is tested. Thanks again!
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    Incorrect spark plug gap cause loss of RPMs at WOT?

    I have the TB IV ignition, so I will still need to check the timing and also verify it is not set in base timing mode. As far as fuel goes, I disconnected all the fuel lines added teflon tape to all threaded connections and re-torqed. I then drained and replaced the fuel/water separator filters...
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    Incorrect spark plug gap cause loss of RPMs at WOT?

    10-4 After some further research, I've seen where faulty ignition sensors can start causing strange problems so I think I'm going to go ahead and replace those as well since they are relatively cheap. Hard for me to believe they would both be going bad at the same time though.
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    Incorrect spark plug gap cause loss of RPMs at WOT?

    The carbs or the issue with the electronic choke?
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    Incorrect spark plug gap cause loss of RPMs at WOT?

    Update: I cleaned the flame arrestors (both extremely dirty) and replaced my props with some new aluminum OEM spec 3 blade 14x19 and ran the boat this past weekend. No change in RPMs at WOT, still idles and runs well but only achieves 3600-3800 revs for both engines. One thing I noticed is that...
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    Incorrect spark plug gap cause loss of RPMs at WOT?

    Good suggestion. Unfortunately, I'll have to wait another couple of months before I can jump in the water with some snorkel gear to check it out as water temps are only in the 50s and I don't have a trailer for the big gal.
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    Incorrect spark plug gap cause loss of RPMs at WOT?

    No, the first season I owned the boat, it had the original Champion plugs and it ran in the normal 4400-4800 RPM range. The boat was previously owned by another gentleman who also kept the boat in freshwater year-round.
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    Incorrect spark plug gap cause loss of RPMs at WOT?

    Yes, I noticed the loss of RPMs at WOT after the first season I owned the boat and after I had replaced the original spark plugs. This boat stays in freshwater year round, so I couldn’t tell you how dirty the bottom is. I do know I have already put it through it’s paces some this year to try and...
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    Incorrect spark plug gap cause loss of RPMs at WOT?

    I agree, but both engines are running smooth and at the same RPM, so I find it hard to believe both carbs are fouled, but I guess bad fuel or trash could have done so to both at the same time. I will definitely try removing the arrestors and going for a run to see if there is any difference as I...
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