1994 dynasty jet storm 90hp mercury sport jet no spark

[jcochrane281]

There has been a lot of post on this engine and I want to make sure I'm just replacing what I need to this 90hp has the red stator and when I ohm the green/white and the white/green I get nothing ohm them together or to ground nothing I am getting good numbers off my trigger and not to sure on checking the switch bow BUT on my two yellow wires where they connect to the other yellows going to the regulator the plastic water proof covering is slightly melted and discolored could the reg be bad and caused the stator to fail as well thank you for taking the time to read this post and any pointers or advise is a plus!

 

[jcochrane281]

Re: 1994 dynasty jet storm 90hp mercury sport jet no spark

Update: I am getting 20-25 volts ac from both green/white and white/green is that week?

 

[jcochrane281]

Re: 1994 dynasty jet storm 90hp mercury sport jet no spark

20-25 volts was wile trying to crank "engine spinning"

 

[jcochrane281]

Re: 1994 dynasty jet storm 90hp mercury sport jet no spark

OK the 20-25 volts ac was just using ACV and my dig meter set to hold max and if reading other post that is different from reading the peak wave with a dva so I will have to look into a dva but do I need a dva to check my cdi?

 

[Maxz695]

Re: 1994 dynasty jet storm 90hp mercury sport jet no spark

Some spark on half the cylinders usually means bad switchbox. No spark with top notch wiring usually means stator is dead Just my opinion. The cause of this is what you need to address. Unless you blew the main capacitor in the swithbox rendering it (the swithcox) totally dead

 

[jcochrane281]

Re: 1994 dynasty jet storm 90hp mercury sport jet no spark

The wiring looks good no spark on any cylinders trigger ohm'd out good kill switch checked out it has to be stator or cdi box I hope the cdi box but only test will tell!

 

[Maxz695]

Re: 1994 dynasty jet storm 90hp mercury sport jet no spark

View attachment 174070at present I,m running two switchboxes as I blew out Number 3 on the switchbox and I,m using a dead switchbox that the capacitor blew on. I used the terminal for the doide to run CYL 3 on. Confusing maybe but the main capacitor will kill the entire main current from the stator to the trigger but will not kill the terminals for the trigger to coils. so I got away with it until my new SB shows. I just did a rebuild and wanted to check all 3 cylinders and so I thought I did and It worked. thats why I don,t throw away old parts. The main capacitor runs the top blue red blk yellow blk wht. the circitry for the trigger to coils is seperate

 

[jcochrane281]

Re: 1994 dynasty jet storm 90hp mercury sport jet no spark

my engine looks a lot different its the 90hp sport jet like this crowleymarine.com/mercury-outboard/parts/1546_70.cfm

 

[Maxz695]

Re: 1994 dynasty jet storm 90hp mercury sport jet no spark

I understand but the pricipal is the same

 

[oldman570]

Re: 1994 dynasty jet storm 90hp mercury sport jet no spark

As to the question about the discolored wire insulators causing trouble. If at anytine the motor was jump started and the jumpers were hooked up reversed for just a short time, or the motor was run with bad conections to the stator or recitifer, damage to the stator and or switchbox can be done. The insulation on the recitifer wires should not look as if they had been that hot unless that conection were going bad. If the trigger and stator ohm test good, then I would belive that the switchbox would be the problem and that the charging system be looked into and tested also.JMO
Oldman570

 

[Maxz695]

Re: 1994 dynasty jet storm 90hp mercury sport jet no spark

I blew both the stator and the switchbox as the wiring harness wore through when rising to meet the rotating flywheel exposing the wires and toasting Both the stator and the swithbox See my new tie down (see pic) View attachment 174075 I had to litterally drill holes and add a 120 copper AC ground wire for a hold down that was one expensive occurance that will never ever happen again and I blame mercury for it WTF. Thank god I test on land before hitting the OCEAN. If it can happen it,s probably happened or will happen to me in the future but thats why I can at least give some kind of tangible advise. You can also see my handy dandy splice and dice testing wiring system, The NG grounds are now 120 Neg volt AC wires (Hard) I won,t use that on the + side as not to kill another stator but they could use some refreshment along with the trigger too

 

[jcochrane281]

Re: 1994 dynasty jet storm 90hp mercury sport jet no spark

can anyone tell me how to test the cdi?

 

[Maxz695]

Re: 1994 dynasty jet storm 90hp mercury sport jet no spark

I,m not sure which site but CDI has a website with the testing proceedures on it. Check here http://outboardparts.com/mercury/troubleshooting/troubleshooting11.htm also here is some good testing proceedures http://outboardparts.com/mercury/troubleshooting/troubleshooting2.htm Also Info on using a maintanance free battery causing overchaging here http://outboardparts.com/mercury/troubleshooting/troubleshooting8.htm Here is the enitre site http://outboardparts.com/mercury/miscellaneous/troubleshootinghelp.htm

 

[jcochrane281]

Re: 1994 dynasty jet storm 90hp mercury sport jet no spark

Thanks for the info!

 

[jcochrane281]

Re: 1994 dynasty jet storm 90hp mercury sport jet no spark

Ok so today I pulled the flywheel off and removed the stator and the stator has a good bit of rust on it. I'm thinking about sanding the rust off with some emery cloth what do y'all think should I try this or is it a waist of time?

 

[Maxz695]

Re: 1994 dynasty jet storm 90hp mercury sport jet no spark

Go for it and use some PB Blaster rust inhibitor corrosion inhibitor lubricant as well. It can be aquired at any auto zone don,t spare it on the stator do all the electrical with it as well.
.

 

[jcochrane281]

Re: 1994 dynasty jet storm 90hp mercury sport jet no spark

398-832075-A3 Is this the Right red stator for my 90hp from what I see this might be for 40-50 hp does that make a difference and I cleaned it up this morning and reinstalled it and got One spark and that was it so Im 99% positive that the stator is the problem
it was pitted really bad from the rust!

 

[Maxz695]

Re: 1994 dynasty jet storm 90hp mercury sport jet no spark

If the stator is that bad check the magnets on the flywheel too. If enough corrosion built up it is possible that contact of the flywheel and the stator may hve shorted it out. Heres a used stator for the numbers you gave at a good price. 49.99 or make offer not to bad Used Red Stator Assembly 398 832075 A3 Mercury Outboard | eBay Heres the page of them http://www.ebay.com/sch/i.html?_trksid=p3984.m570.l1313&_nkw=398-832075-A3+&_sacat=0&_from=R40 Make sure you get the right stator. Check your engine HP SN etc here http://www.marineengine.com/parts/mercury-outboard-parts/

 

[jcochrane281]

Re: 1994 dynasty jet storm 90hp mercury sport jet no spark

Maxz695 Thanks for all the help I have been looking at stators on ebay and looked at that same one to the flywheel magnets are ok I hope that just replacing the stator will fix it so i can get to fishing

 

[jcochrane281]

Re: 1994 dynasty jet storm 90hp mercury sport jet no spark

And from what I found all these stators are the same CDI's Cross reference shows the following
398-832075A 3 -- 174-2075K 2
398-832075A 4 -- 174-2075K 2
398-832075A12 -- 174-2075K 2
398-832075A17 -- 174-2075K 2
398-832075A21 -- 174-2075K 2
398-832075T18 -- 174-2075K 2
P/N CDI P/N