Chevybigblock, Sport Jet 120xr starting issues,bayliner jazz

[ChevyBigBlock]

My 1996 jazz will not start.
Ive been looking it over and I have spark and fuel. First i was checking for spark by grounding out the plug, I had spark, It actually started with the one cylnder down, so i put the plug back in, it wouldent start, took it back out and it started... so thinking maybe i wasnt getting enough juice either in cranking power or power to the ignition system i hooked up a battery charger, set it on 125amp start and it started up. I shut it off, let it sit for a few minutes then tried without the jump start, it didnt work so i hooked it back up, it started again for a second then blew the ride plate off. DONT START THIS BOAT UP OUT OF WATER WITHOUT A FLUSH KIT!!

So basically im sking why this worked. The battery I was using was two years old and sat for around year maybe. It was dead when i got it so i put it on a 2amp charger for about 20 hours to make sure it would be good and strong. It seemed to be cranking good and strong before the battery charger maybe a little faster but that could be expected with the battery charger set on jump start.
So any ideas? The spark plugs have set in it im guessing all winter if not longer i just recently got this boat but the plugs dont look bad. I bought this boat from a friend and it has had trouble starting before but hasnt ever died on the water just had problems starting for the first time i think.I remember it flodding because we cranked on it so much one day but it hasnt seemed to flood sinve ive been trying to get it going.
Could i have a weak link in my ignition system that isnt giving my plugs enough power? would hotter spark plugs help?Im running champions right now and would like to switch to ngk before i try to start it again.

Any thoughts or ideas would be appriciated and mite help others having the same trouble. also if my saftey key is unplugged should i be able to crank the engine? because i can but i havent checked for spark with it off.

 

[kend301]

Re: Chevybigblock, Sport Jet 120xr starting issues,bayliner jazz

Chev , post up your engine serial number so i can pull up a parts list and see which ignition system you have. The serial number will be on a silver and black 1 1/2" decal on top of the engine. Slow cranking speed can result in no spark you need at least 250 cranking RPM to get spark. Also these things are bad about clogging the carb vents . there should be some 1/4" plastic tubing running to them . Remove them and check for varnish buildup . And how old is the Gas ? if it is stale it will cause starting problems.
On to the ride plate stuff , First please be aware there are 2 flush kits available , a "consumer" kit used just for cleaning it is attached to the top of the head , you can't run the boat with this type. The "Dealer" flush kit is a fitting that goes on the water pickup hose after you disconnect it from the lower engine plate . You can run the boat up to 1800 rpm with it but NEVER in gear. Remember do not use full hose pressure , just flow of you will water flood the engine. When your ride plate blew did it come off the boat and damage the hull or did it bend the plate ?
in the mean time see my post on sport jet basics at the top of this thread and just ohm the stator and trigger , post readings .
And have you ever confirmed a no spark condition ? as in cranking while testing for spark and had none ?

 

[ChevyBigBlock]

Re: Chevybigblock, Sport Jet 120xr starting issues,bayliner jazz

Hey my engine serial # is OE148395,I have checked for the varnish buildup and I dont see any in the tube maybe some in the T shaped fitting but im not sure about pulling it off, but I dont think its plugged.The gas that was in it had stabilizer in it but I drained it anyways, pumped the old fuel out of the line and drained the carb bowls also I just ran a piece of fuel line/filter into a can of fresh in the bottom of the boat for now so I know its not sucking up anything but pure fresh gas. This boat was a friend of mines and he had problems starting before even with fresh as in the tank.
Im looking into a flush kit but I see thier around $70 and id rather try to make one myself or get a fitting, I can make about anything at my shop,im just not sure where it plums in at.
when the plate blew it just bent the front half down and ripped the holes out of the plate so i wont have to put new threads in the holes. I put the plate in a press at work and it looks good and stright but i havent tried to put it back on yet but im aware that it needs to have a good seal. the hull doesnt have any cracks in it that i can see so i think i just screwed up the plate but im not sure whats above the plate or if the pressure could have done anything internally to me engine. im not sure how these engines work at all.
When i had the plug grounded out i had a buddy watching it and he said he didnt see any spark at first then it was weak looking but spark is spark i guess, when i watched it, it was imedate and looked a little less brighter than an average cars spark. I have never seen it not spark.
Im unfamillar with a trigger and stator but i know what they look like just because i reserched this engine before bought the boat and figured i was going to have to buy them but i dont know where thier located, just that the black ones go bad and the red runs cooler but then someone told me it was the other way around so im lost on the red or black..., im guessing they are under the flywheel cover but i have no idea which wires to test. Ive seen other threads on here about it but i cant seem to find them again but ill try and find them and get them tested and get some data to you, Ill let you know later tonite if i couldent find the wire info and maybe you can be more specific for me.

Thanks alot for hanging in here with me I really appreciate it and hope I can pass this on to someone else in need.

 

[ChevyBigBlock]

Re: Chevybigblock, Sport Jet 120xr starting issues,bayliner jazz

I cant seem to find much could you tell me which wires i should check? Im not sure what stator i have Ive herd the red and black stator have different wire colors. I cant get the flywheel off I think im going to need an impact or a better way to keep it from spinning. Im so tired right now i didnt put much effort into it but if i knew which wires to check I guess I dont really need to pull the flywheel. Im not sure of the procedure for checking these,Im guessing i would have to be turning the engine over while im testing? Can i just pull the plug to keep it from firing? Would it be a good idea to keep the fuel on so the engine stays lubricated while cranking or will it still inject the oil?
I would upload pic to show you what im working with but i dont understand why its asking me for a web address, Ive spent way too much time in the garage working on cars aparently...im falling behind. Check my profile for pictures. Everything should be in place I think I have a faulty ignition part but Im a marine engine noob .Is it safe to start it with the ride plate off?Either way im not starting it till i have a kit on it. I keep wondering why it would only start with a 125amp jump on it.

 

[kend301]

Re: Chevybigblock, Sport Jet 120xr starting issues,bayliner jazz

OK you have a 96 as you stated and a CDM ignition system ,Odds are you have a red stator , to tell look at the wires coming from under the flywheel cover , you should see 2 harnesses , one for the stator and one for the trigger . the red stator harness will have 2 yellow , Green/white and white/green coming out , to ohm stator disconnect the green/white and white/green and hook up the meter to the wires going to the flywheel area without turning the engine over , key off . The other harness should be black ,white, purple, brown that is the trigger .unplug them all and using the black as ground ohm the other 3 wires individually key off and post results.
If you go to the thread CHRONOMANIA there are some good pictures of the stator , trigger and side shot of harness so you can get an Idea where they are .
As far as the 125 amp to start thing if your battery is bad that may be a problem , have it tested , it takes 250 cranking RPM to fire the ignition system . If the battery fails a load test replace it !
Sounds like the ride plate should be OK as you stated be sure you have a good seal , level plate with hull and you should be fine .
The flush fitting goes on the end of the black hose that attaches to the lower engine plate , you disconnect it there and put the fitting on the line and then attach hose , from the price you posted the dealer is selling you the "consumer" flush kit , NOT to be used to run the engine !! You can buy a simple fitting at LOWES for the hose and you have a Flush Kit !

 

[ChevyBigBlock]

Re: Chevybigblock, Sport Jet 120xr starting issues,bayliner jazz

Ok so I tested the stator, unplugged the green/white and white/green hooked it up and got 236.6.
In the other bundle of wires I have a black,white,brown,purple and a blue. What's up with the blue guy? I haven't tested the trigger the wires won't pull apart so I'm going to get some new connectors first.

 

[kend301]

Re: Chevybigblock, Sport Jet 120xr starting issues,bayliner jazz

OK I want to be sure you are checking the stator ohms on the wires from the stator and not the ends going to the CDM packs . Also be sure they are unplugged and key is off . You need to be checking the ends coming from under the flywheel cover . I know this sound kinda retarded but your stator readings are way out of spec . It should ohm 500-700 . Retest to confirm your readings and post up .

The Blue wire is your 4th trigger wire (120 4cyl engine), Sorry I just got done with several 90 hp 3 cyls and forgot to include the blue trigger wire , test it the same way as white,brown and purple.

 

[ChevyBigBlock]

Re: Chevybigblock, Sport Jet 120xr starting issues,bayliner jazz

Hey I tested the stator again This time I got .236 with different meter...I checked the others on the trigger and im not getting anything.

 

[ChevyBigBlock]

Re: Chevybigblock, Sport Jet 120xr starting issues,bayliner jazz

I just pulled the flywheel, I have a black stator ..it looks like there's a bubble coming out of it like it got hot...a couple of the magnets are loose but don't look like they have moved any. Well I've herd the black ones go out so I'm thinking about ordering a red since I have the flywheel off but ill wait till I hear from you, don't really want to waste $200 so much. Do you know if is have to get a conversion kit or anything for switching the two?

 

[kend301]

Re: Chevybigblock, Sport Jet 120xr starting issues,bayliner jazz

You need to call me , check your PM's I have sent my cell number , I just want to clarify a few things .

 

[kend301]

Re: Chevybigblock, Sport Jet 120xr starting issues,bayliner jazz

Stator is bad , most current part number is 398-832075a21

 

[Don S]

Re: Chevybigblock, Sport Jet 120xr starting issues,bayliner jazz

Not sure if you guys can use this, but here is the OEM service manual for the 95-97 90 to 120 sport jets.
http://www.4shared.com/document/5oJr-VY6/Merc90_Sport_Jet_95-97.html

 

[kend301]

Re: Chevybigblock, Sport Jet 120xr starting issues,bayliner jazz

Thank you Don , my manual covers 93-95 and I rely on some manufacturer diag sheets for info on 95 and up . This will help the "Sport Jet World" tremendously !!!

 

[ChevyBigBlock]

Re: Chevybigblock, Sport Jet 120xr starting issues,bayliner jazz

Hey kend, I have a guy who is a marine mechanic that i talked to before i called you, he just called me back saying i need to get a stator 398-832075a6 and a rev limiter a21 889 a52 to replace my burnt one. He's getting his info from a merc bullitin. I typed in 398-832075a21 (your recomended stator) here at iboats and it brought up Part # 18-5870 which at the bottom says replaces OEM part #, MERCURY MARINE 398-832075A21
Is this right or do i also need a rev limiter? Ugh so lost now lol. I next day shipped ityesterday and will get it tomorrow Id like to try this thing out and get her going by this weekend but dont want to burn up new parts or anything!

 

[kend301]

Re: Chevybigblock, Sport Jet 120xr starting issues,bayliner jazz

18-5870 is a Sierra aftermarket part number , nothing wrong with them at all . Post the number on the rev limiter that is on your boat , they all update to 821889a51 and the a52 could just be more current than the catalog I use . If your rev limiter is an 821889a29 may not be a bad idea to replace it , if it is a40 or above you should be ok .

 

[stevesmustang]

Re: Chevybigblock, Sport Jet 120xr starting issues,bayliner jazz

is it a recall on that part?

 

[kend301]

Re: Chevybigblock, Sport Jet 120xr starting issues,bayliner jazz

Nope , just a update service bulletin .

 

[ChevyBigBlock]

Re: Chevybigblock, Sport Jet 120xr starting issues,bayliner jazz

It's aaaahhhlive! She's running guys.

Thanks to kend301 he's the man!

other issues...theres a constant alarm when i put it in engine was cool hadnt ran for over 30 seconds,oil was full but was about 2 inches lower in the resviour after only 5 min of running,was smoking fairly good I'm not sure what the average for smoke or oil consumption is but I'm sure it isn't that bad. New thread?