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No spark on 96 xp 787

Bpjr3870

New Member
Messages
13
Location
Ohio
Water Crafts
Seadoo xp 787 bored 800
I have a 96 seadoo xp 787 let my dad put a battery in it and he put the little ground wire to the ignition coil on the positive post. After finding that out i discovered the coil has a big crack in it and i then replaced it. I have no spark now after new coil. I chack the white wire going to bottom of coil and its only showing 0.06v when cranking. The seadoo ran good during the summer but i know something is still messed up i get 2 beeps when putting key on nob as well
 

Matt Braley

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7,029
Location
Niceville, Fl
Water Crafts
I can't keep up with it anymore. I've got some really cool skis!!
Is the white wire on the + or - side of the coil? Did you get the plug wires pushed down into the replacement coil all the way?
 

Bpjr3870

New Member
Messages
13
Location
Ohio
Water Crafts
Seadoo xp 787 bored 800
Tried the black and white on both sides and the new coil came with new wires
 

mikidymac

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Did you remember to connect the little black wire to the battery negative in addition to the big black negative cable?
 

AKnarrowback

Well-Known Member
Messages
553
Location
Fairbanks Alaska
Water Crafts
94 xp
94 sp
94 gtx
Did you remember to connect the little black wire to the battery negative in addition to the big black negative cable?
I was thinking the same thing. My gtx did what you are describing and it was the small wire on the neg post, the crimp on connection flexed and snapped off.
 

etemplet

Premium Member
Premium Member
Messages
2,756
Location
Louisiana
Water Crafts
1996 SPI, 1996 GTX, 1997 GTX
Did you check all of your fuses? There is one on the holder relay that might have blown.
 

Bpjr3870

New Member
Messages
13
Location
Ohio
Water Crafts
Seadoo xp 787 bored 800
Yes I connected the small black wire to the negative my father put that on the positive and burnt something up I checked all the fuses there are a total of 5 they are all good I did a multimeter from the negative to the bottom of the ignition coil where all the ground meat and I'm getting a good connection there I also put new bolts in that spot to get rid of the old rusty one I've literally check everything I even checked the new ignition coil to verify that it's working with a multimeter and the videos that I seen online to show you how they work and how to test them my multimeter is reading the same thing that they are getting I am at 100% loss it ran 3 months ago now just won't run with this problem that I'm having
 

etemplet

Premium Member
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Messages
2,756
Location
Louisiana
Water Crafts
1996 SPI, 1996 GTX, 1997 GTX
Did you check the 6 prong pin connector on the Mag? The pick up coil not functioning properly will prevent spark. It could be totally unrelated and just a coincidence. Even if the pick up checks out OK, there could be debris stuck to the magnet or rust. If the pick up cannot verify the firing point, the engine will not spark. I fought this for a period of time on my 96 GTX which is in the picture. Good Luck !!Seadoo stator Pick up Edit.jpg
 

Bpjr3870

New Member
Messages
13
Location
Ohio
Water Crafts
Seadoo xp 787 bored 800
I didn't check that only because it was just running a month ago the battery was bad so I told him just to go battery in it and I'll pay him back so that's what we did and then the Box near the battery was smoking and figure out what he had done replace the coil and figured it would start right up but it must have hurt something else I don't think it would hurt the mag
 

etemplet

Premium Member
Premium Member
Messages
2,756
Location
Louisiana
Water Crafts
1996 SPI, 1996 GTX, 1997 GTX
You can check resistance on the pick up to see if it is good but that won't tell the whole story It is something that will prevent the ski from firing. If you are not getting voltage to the coil you need to work backwards from there. Good Luck.
 

Bpjr3870

New Member
Messages
13
Location
Ohio
Water Crafts
Seadoo xp 787 bored 800
How would I go about checking resistance I read somewhere that said if you check it wrong that it can mess it up. Also I follow the white wire back it goes to the computer that is inside the front watertight compartment could that have been messed up if so I'm betting on that because the white wire goes straight to that and that's the next thing after the coil
 

etemplet

Premium Member
Premium Member
Messages
2,756
Location
Louisiana
Water Crafts
1996 SPI, 1996 GTX, 1997 GTX
There is a way to check that the trigger coil is working. I don't know how but I'm sure if it is working you will be able to measure voltage and pulses in the wires. You also could have a damaged CDI. Difficult checks to verify issues. Good Luck !!
 

Bpjr3870

New Member
Messages
13
Location
Ohio
Water Crafts
Seadoo xp 787 bored 800
okay I just found a form online where you can test the mag if it's coming up between 160 ohms and 300 ohms the mag is good mine is coming up at 231 ohms so we know that that is good and I have a new coil so that is good the white wire that runs from the ignition coil to the front computer is not showing any signal so im thinking it's something in the control box up front any advice will be great I found two complete new boxes online Both are $279 just want to make sure I check everything before I go purchasing that
 

etemplet

Premium Member
Premium Member
Messages
2,756
Location
Louisiana
Water Crafts
1996 SPI, 1996 GTX, 1997 GTX
You still don't know if the pick up coil is working properly, I'm not saying it isn't. If it was mine, I'd pull the front cover off the mag and have a look inside. Don't go throwing money at these skis they will eat it up and still not run. Download a manual and to the proper testing of the MPEM and CDI. Take your time, measure 3 times... cut once. I have lots of spare parts for these skis... sometimes I change stuff I believe is bad and it isn't.
 

Matt Braley

Premium Member
Premium Member
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7,029
Location
Niceville, Fl
Water Crafts
I can't keep up with it anymore. I've got some really cool skis!!
Sounds like you popped the CDI or the MPEM. Both of those are up front in the grey box. Usually it's the CDI but a MPEM can also cause a no spark issue without losing any other functions. Don't spend too much (over $200 total) because some people put big prices on that stuff. Don't fall for the aftermarket MPEM's because a lot of folks have had issues with those.
 

Major Woody

Member
Messages
58
Location
Portlandia
Water Crafts
'97 GSX, '96 XP
Also worth noting that if the bracket for the pickup coil rusts away and it moves out of position, it will still test ok electrically but you will get no spark.
I would pull the mag cover and have a look before I ordered parts.
 

Matt Braley

Premium Member
Premium Member
Messages
7,029
Location
Niceville, Fl
Water Crafts
I can't keep up with it anymore. I've got some really cool skis!!
Naw this was a running ski before the incident. Not likely that the metal pickup support broke off do to crossing the battery.
 

etemplet

Premium Member
Premium Member
Messages
2,756
Location
Louisiana
Water Crafts
1996 SPI, 1996 GTX, 1997 GTX
I'm with ya Matt. Probably is the CDI and even the tests on those things don't prove much. :)

Since it took me much time and research to find the problem with my very first 787, I kinda lean that way. You NEVER know what is lurking in the Mag area. This is a recent 720 I am working on. You just never know if the ski went under water or anything. My goal is longevity so I don't want surprises later on. I like to take a look that way when if there is a problem I know what it "isn't" and can look elsewhere with a degree of confidence. . LOL




GTI 717 Mag (1).JPEGGTI 717 Mag (2).JPEGGTI 717 Mag (3).JPEGGTI 717 Mag (4).JPEG
 

Bpjr3870

New Member
Messages
13
Location
Ohio
Water Crafts
Seadoo xp 787 bored 800
Well I didn't think I needed to get this far into it but I guess I should have included this as well I rebuilt the entire motor 2 years ago when I first got it the oiler in the front on the crank wasn't pumping oil to the rear cylinder so I lost compression in the rear cylinder tore down completely bought 82 mm Pistons and rods I had the crank taken out and tested I bored over the cylinders to 82 mm because of the scoring left behind I had all that apart before and cleaned everything up and put it back together I went with a block off plate in the front and I just mix my oil now motor has Maybe 40 to 50 hours on it was literally running not long before I had my father put a new battery in it we had it running in the driveway with water I had to jump it with my truck after that I put it back in the garage and ask him if he gets time to replace the battery so he did and then put the negative wire on the positive and now the problem is happening
 

etemplet

Premium Member
Premium Member
Messages
2,756
Location
Louisiana
Water Crafts
1996 SPI, 1996 GTX, 1997 GTX
Given this new bombshell :D :D I'm with Matt. Change or check the CDI.
 

Bpjr3870

New Member
Messages
13
Location
Ohio
Water Crafts
Seadoo xp 787 bored 800
Just bought the whole cdi unit box thats in the front of the seadoo for 175 on ebay said it was pulled from a running unit and had a 30day return so when i get it ill put it in and try it out and give you guys an update
 

Matt Braley

Premium Member
Premium Member
Messages
7,029
Location
Niceville, Fl
Water Crafts
I can't keep up with it anymore. I've got some really cool skis!!
Well I sure hope it'd not the MPEM then. Or did you get the whole greybox? If so I hope it comes with the coded key and that is a good price.
 

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