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    Spark but no start

    Thanks Chris, I know that and had timed to that (or so I thought). I have resolved it however. I timed it by watching the #1 intake close and then rotate until TDC on harmonic balancer is at TDC. Then I aligned the rotor with #1 on the cap and figured that was good. Somehow, this resulted in...
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    Spark but no start

    I have a Thunderbolt IV on a 5.7L engine. This is a repower and I cannot get the engine to start. I have chased what I believed to be wiring/ignition issues and now have resolved and I have confirmed spark at the spark plugs but a no start condition. There is not even the hint that the plugs are...
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    Tuliped valve causes

    I have Mercruiser 5.7l, Thunderbolt IV, S/N OD724908, 1992 24' Searay BR, I have tuliped #6 exhaust valve twice, on 2 different motors. I have changed virtually EVERY part on this latest motor and still it tuliped a valve. What could possibly be the cause so that I don't do that again? I...
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    Thunderbolt IV Timing mark question

    I know that there are timing questions all over this forum but I have not read about this. I have Mercruiser 5.7l, Thunderbolt IV, S/N OD724908, "Engine Rotation LH", 1992 24' Searay BR, Stock size 19P prop. New-to-me boat and I am having trouble getting to WOT. I am going through the Low...
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    Boat alarm location

    I hope this is the correct section to post this. I have a new-to-me 1992 Searay 240BR and I need to find the location of the engine alarm for the water temp and oil pressure. I do not get an alarm test sound when the key is in the on position not running so I don't know where the sounds should...
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    Low WOT MERCRUISER 5.7l Thunderbolt ignition

    I just bought a 1992 Sea Ray 240BR . Took it out last week and it ran poorly, coughing and sputtering and not much power. It only ran at 3200rpm at WOT. I took off the Rochester Quadrajet 4bbl carb and rebuilt it. It was very dirty and gummed up so I figured that was the problem. I reinstalled...
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    70hp Yamaha tach inaccurate

    I have a '88 70hp Yamaha and the tach is inaccurate. I suspect the rectifier but need expert advise to know for sure. The tach functions but registers about 2700 rpm at WOT (motor is reasonable wide open based on speed and sound) and registers about 1200 at idle. So, seems to read about 1/2...
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    Hit sandbar, what should I do now?

    I hit a sandbar at nearly full throttle. It was only deep enough for prop to hit as boat remained floating. I obviously got out ok and boat is running ok I think but I am just wondering if I should do anything or inspect anything to make sure all is ok. I don't think it got up to the water...
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    Yamaha 70etlg no buzzer and reduced power

    '88 Yamaha 70etlg. Boat was running fine then it reduced power to about 1/2 rpms. After about 15 minutes of near full throttle run the rpms dropped to 1600 on my tach but not sure if that is accurate. Boat ran for another 15 minutes back to the dock at 1600 rpm smoothly and without issue but...
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