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    knocking sound in lower section of engine cowl, above lower unit.

    i have this 2013 yamaha 90hp that has a knockign sound in the area above the lower unit, i recorded it an here is a video. https://photos.app.goo.gl/zsi6hj8K7PGB4Ewa7 i pulled the lower section and the noise is no longer present and i spection found that the driveshaft is 1: rusty 2 has a...
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    loss of power over 3500 RPMS FYI

    i have come across this issue about 4 times this summer and wanted to post it here in case others are experiencing this issue. boats would run great at idle and under load but when you climb over 3500 the engine would bogg down and stall. and may keep running if you pull back on the throttle...
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    I'm stumped, overheated 4.3 MPI, water in oil, replaced heads, still water in the oil

    so i got this boat with a 2004 merc MPI, 4.3 engine. the customer overheated due to picking up a plastic bag and starving the impeller of water. i pulled the heads after finding low compresssion and had the checked for cracks and resurfacing. changedthe oil, etc... reassembled the engine and...
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    98 4.3 w/ thunderbolt IV, carb, electrice fuel pump craps out

    i have this boat that had a bad fuel pump @ the beginnning of the season and now it runs but when getting up on plane, actually once up on plane, the rps take a nose dive. if i do not touch the throttle, the engine dies, starts right up. if i pull the throttle back to idle, the engine stays...
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    2000 5.7 craps out when going above 3500

    so i have this 5.7 v/p. carbureted engine that when after getting up on plane, the rpms take a nose dive and if i pull back on the throttle, it will sputter but clear up and i can continue to run it. if i leave the throttle down, it stalls out. it starts right back up each time. the carb was...
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    2010 350 Mag MPI bravo 3 gaurdian mode issue. 5% power

    hi all, i have a boat that is going into gaurdian mode under load over 3000rpm, then when you pull back on the throttle, it goes back to 100%. the rinda says gaurdian cause: exhaust co. now i do not know if it is actually CO or that is as much of the word that would fit on the screen. there...
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    bravo coupler wobble after new engine install

    hey everyone, i am beating my head about this and wanted to through it out to the forum. i just did an engine job on a boat, 1994 5.7 carb with bravo3 drive and got it all ready, alignment was spon on, you could blow on the tool and it would spin in the coupler( LOL ) i installed the drive and...
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    water leaking from top cap of upper gearcase

    i resealed an alpha 1 gen II and after starting it up there is water leaking out of the top cap, i removed the cap and replaced the rubber plug that seals up thewaterjacket and its still leaks, i cleaned all the crud from the 2 mating surfaces and still leaks. no water is getting into the...
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    boat info library inop?

    hey anyone have trouble accessing the boat info library or is it just my screwe up computer? i can go on the site, choose a manual but it asks for access to run adobe, i give it access and flash is blocked, i unblock it but the manual mostly does not come up, if it does, there is no search...
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    2004 6.2 MPI bravo engine with fuel problems

    this motor has no serial #, no flame arrestor cover. that being said, the engine takes a nose dive when going full throttle the pressure tested confirms the fuel pressure drops to 10PSI . i know its the pump, but the issue is, i hve not seen this set up before, it has 3 pumps, 1 on the engine...
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    cross referance for universal joint, gen II drive, internal clips.

    i searched the forum and found info onthe external clipped joints but can't find the internal ones. it seems like i spend time looking for them every time i need them. maybe one day i will write the part # down. ugh
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    2006 v/p 5.7 GI-E alarm sounding, power restriction/ limp mode

    hello all, i am having a problem with this boat, originally it would not start and i found no fuel pressure from HP pump., further investigation found the harness side of the f/p connector had the 2 wires bare for the 1st 1/4" out of the connector and intemittently would make a poor connection...
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    2005 5.7 gx-f stumbles @ 900-1100 RPMS

    hey GUys i need some help, i have a 2005 gx that was running poorly and intermitently no start. the fuel pump terminals were all corroded and the pump was not working properly so that was replaced, then it would run fine but not great.and developed a stumble @ 900 through 1100RPMS. then it...
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