93 Bayliner Jazz Doesnt run in water. Please help!

[BananaRiverBoater]

Hey Guys,
I have a 1993 bayliner jazz with a 90 hp force engine. It sat for about a year but ran fine before that. I just recently cleaned the carbs and fuel system and washed/waxed the boat, getting it ready to ride. It starts up and runs great on the trailer but when I put it in the water, it runs for maybe 30 seconds and slowly bogs down and shuts off. So after killing the battery trying to restart it, I put it back on the trailer and pulled it out of the water and it started right up. So I lowered it into the water again running and was able to get into the boat and back it up, but when I put it into drive, it bogged down and died again, refusing to start. I'm guessing either the propellers resistance in the water is slowing the engine down or could there be a seal leak letting water into the crankcase? I notice when the engine is running in the driveway, the propeller is making a slight rattling sound, which I thought was normal. Any help is appreciated. Thanks in advance.

 

[roscoe]

Re: 93 Bayliner Jazz Doesnt run in water. Please help!

Time to inspect the sparkplugs for signs of water, and then do a compression test.

 

[BananaRiverBoater]

Re: 93 Bayliner Jazz Doesnt run in water. Please help!

Compression is 85, 95 and 95 and I remember thinking the plugs were just wet from my fingers when I pulled them out. But if they are wet from water how would it get in? A main seal to the pump? Thanks for your pointers

 

[Frank Acampora]

Re: 93 Bayliner Jazz Doesnt run in water. Please help!

Check the depth of the engine in the water.

If the idle releif vents are below the water or plugged (mud daubers like to nest there) This can cause stalling, yet the engine will run fine with the exhaust snout or prop (if it is thru-hub exhaust) out of the water.

Try motoring away from the dock with the engine tilted so the prop is just below the surface. Then accelerate as you trim down, and see what happens.

 

[further]

Re: 93 Bayliner Jazz Doesnt run in water. Please help!

You mentioned you just cleaned the carbs - did you rebuild them or remove them. Did you lync and sync correctly? I had the same issue - would start right up and run fine on muffs but when put in the water under load it would bog down after giving some throttle, even got to the point where weight would affect bogging (i.e. passenger in the bow). Turned out that I didnt have the carbs lynced and synced correctly.

 

[backwater dawg]

Re: 93 Bayliner Jazz Doesnt run in water. Please help!

Hey guys---a Bayliner Jazz is a jetboat--a 90 hp Force powerhead bolted to a Merc jet----try checking the water intake grate on the bottom of the boat and check the rear jet nossel and make sure its clear---good luck Steve

 

[BananaRiverBoater]

Re: 93 Bayliner Jazz Doesnt run in water. Please help!

Yeah its an inboard jet boat. I'm meticulous when it comes to putting thingsd back together but I'll check the carbs again just in case. I'll also check the intake grate. If there is water on the plugs could this be a seal? Thanks guys

 

[JAKER95XR]

Re: 93 Bayliner Jazz Doesnt run in water. Please help!

I have a 96 merc. inboard jet with a 95hsp.I had water getting to the plugs and replaced the exhaust gasket that fixed the water problems.I have had problems with this boat since I bought it.Im still having fuel problems same thing run it on a hose she runs like new put it in the water runs like crap.One thing to look at my manual calls for idle to be set at 950 to 1100 rpm I set mine to 1000 on the hose,when I put it in the water it lowered the rpms to 750 to 800 and shut it down.I had to raise my idle rpm to 1200 on the hose.Also the noise from the impeller is ok a tech. from bass pro told me so.GOOD LUCK

 

[moparman]

Re: 93 Bayliner Jazz Doesnt run in water. Please help!

check the fuel pump diaphragm and check valves if its been setting up for a while,as these things tend to deteriorate over time ,and the check valves [if the old style ] are affected by the alcohol in the fuel that we have now days .These are a few things that might be messing with you. hope these ideas help with your problems. MOPARMAN..............................ROLL TIDE