Downeastrob Sportjet 90 ignition

downeastrob

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Jun 2, 2013
Messages
17
Hi all,

I've been browsing this forum for the last week. Lots of information and helpful people from all over! I purchased a 94 sea ray with the infamous mercury sportjet 90 with no spark. Originally purchased by a friend of mine. It wouldn't turn over but he found a washer jammed between the flywheel magnets and the stator. He gave up and was told the boat is a lost cause.
I tested the red stator per the instructions posted here. Open
I tested the trigger and two wires in spec and one open.

Purchased a used red stator - 695 ohms
Purchased a used original trigger - test ok all three wires

I do not have a DVA tester but need to invest in one.

No power at coil positive with regular MM or at wht/blk on CDI
60 volts on blue wire after "your favorite candy bar"

It seems to me I have a couple options.
Rework a toasted CDI myself as I have seen aksor do on a previous post. What can I lose right?

Purchase a new CDI. Which could burn up at any point it seems.

Purchase a CDM conversion and this is where my question is. With my setup can I purchase the 3 CDM units and the wiring harness and be ok? I see corwley does not have all the parts nor do I want to buy them.

Any information would be helpful
 

downeastrob

Cadet
Joined
Jun 2, 2013
Messages
17
Re: Downeastrob Sportjet 90 ignition

By looking at the wiring diagram and reviewing the part numbers it appears that I could just purchase the CDM's and harness. I guess the mount plate is obsolete but I know how to drill and tap holes to mount the cdm's.
 

downeastrob

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Joined
Jun 2, 2013
Messages
17
Re: Downeastrob Sportjet 90 ignition

As I gave the starter a workout tonight I thought I was getting somewhere when I saw an unbelievable spark.....! Turns out it was cloud to cloud lightning...
 

downeastrob

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Joined
Jun 2, 2013
Messages
17
Re: Downeastrob Sportjet 90 ignition

Looks like you have everything under control here.... Install your parts and lets us know!
 

downeastrob

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Joined
Jun 2, 2013
Messages
17
Re: Downeastrob Sportjet 90 ignition

I've been on the edge of my seat for weeks now! What happened?!
 

downeastrob

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Joined
Jun 2, 2013
Messages
17
Re: Downeastrob Sportjet 90 ignition

Oh, I got it working. Thanks for all the help downeastrob!
 

downeastrob

Cadet
Joined
Jun 2, 2013
Messages
17
Re: Downeastrob Sportjet 90 ignition

Although I had spark the starter quickly died... so I bought a new one. ran backward and spun the starter gear off the helix. hmmm.. fixed that! Plug wires on schematic say purp white brown. no thats not it boom on the ride plate! straightened that out seems to be white brown purple. good to go! 20 mins of fun on the lake and waaaahhhhhh. Burned a hole though the piston on number three. great fun.
 
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