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1993 Searayder sportjet 90- FLYWHEEL

Jetboat Jeff

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Hello All - I am new to sight & hoping someone may be able to direct me to a reputable, classic Searay parts dealer. I need a flywheel for '93 Searayder/Merc sportjet 90. I am in the midwest, but, I am sure it can be shipped anywhere. Any suggestions?? TY
 

the MfM

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I believe it’s the same engine as a 90hp force outboard, so any mercury dealer should be able to get you one.

Double check the part numbers but I think this is it

 
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Jetboat Jeff

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I believe it’s the same engine as a 90hp outboard, so any mercury dealer should be able to get you one.

Double check the part numbers but I think this is it

Thank you so much. As I am not a mechanic - would the part #'s be the same for inboard vs. outboard? My part # is 817494A18. All parts dealers say it is out of production/stock. However, I have been told it may be an interchangeable part. I just need some guidance as to ho to confirm.
 

the MfM

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Your “inboard” sportjet uses the top half of an “outboard”. Basically they used the engine from an outboard and mated it with a jet pump and mounted it inboard your sea raider....if that makes any sense.

So the sport jet shares a lot of the same parts as other Mercury’s. But to complicate matters it looks like the flywheel you have was part of a CDM ignition kit upgrade.

So I’m not sure the one I linked would work or not :facepalm:
 

Jetboat Jeff

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Your “inboard” sportjet uses the top half of an “outboard”. Basically they used the engine from an outboard and mated it with a jet pump and mounted it inboard your sea raider....if that makes any sense.

So the sport jet shares a lot of the same parts as other Mercury’s. But to complicate matters it looks like the flywheel you have was part of a CDM ignition kit upgrade.

So I’m not sure the one I linked would work or not :facepalm:
You were spot on!!! I called Mercury Marine directly. Told her my flywheel is not longer in production. She asked for engine serial #. Then said, "your part is still in production it's part # is 859241T10!" Thank you for getting me on track & allowing me to find this part. Without a little direction I am sure I would still be floundering. TY
 

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The flywheel you have (817494A18) shows up as the one that comes in the CDM ignition upgrade kit. So if she went by the engine serial # you might want to double check that the 8....t10 flywheel will still work.


I’m 99% sure that if you have the CDM kit the flywheel has been swapped... I think Pre 1996 was a CDI ignition and used a one magnet flywheel vs a two magnet flywheel for the cdm kit and post 1996 sport-jets
 

Jetboat Jeff

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The flywheel you have (817494A18) shows up as the one that comes in the CDM ignition upgrade kit. So if she went by the engine serial # you might want to double check that the 8....t10 flywheel will still work.


I’m 99% sure that if you have the CDM kit the flywheel has been swapped... I think Pre 1996 was a CDI ignition and used a one magnet flywheel vs a two magnet flywheel for the cdm kit and post 1996 sport-jets
Below are the Flywheel comparisons. My old ones & the version as supplied from Mercury with my Serial #. Thoughts???
 

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the MfM

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Looks pretty much the same. But there is a difference between the magnet spacing. The new one has bigger gaps. Not sure it matters.

Read this thread...


The last post talks about the different magnet set up in a stock sport jet and one with the conversion kit. I suppose it’s possible that sea ray spec’d the engine to have CDM from the factory in which case we’ve got the right replacement ;)

I just don’t know enough to know what I don’t know. But I know that era of engines had several different ignition setups.
 

Cobra Jet Steering LLC

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Why do you need a fly wheel did the magnets come loose? usually the brains blow out due to a bad rectifier that allows 12 volts to run back to the field wingdings when you turn the ignition off , it creates a bad charge and runs through the brain, the boat will run just fine until you shut off the ignition then it just won't start I did a write up a while ago about replacing your rectifier with a jet ski voltage rectifier so it does not happen , your charging system had electrolytic capacitors for a rectifiers, those converted the AC current from the stator into pulsating DC current if the capacitor went bad The brain got fried . That is the simple explanation any way
Any way just wondering why the flywheel
 

Jetboat Jeff

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Looks pretty much the same. But there is a difference between the magnet spacing. The new one has bigger gaps. Not sure it matters.

Read this thread...


The last post talks about the different magnet set up in a stock sport jet and one with the conversion kit. I suppose it’s possible that sea ray spec’d the engine to have CDM from the factory in which case we’ve got the right replacement ;)

I just don’t know enough to know what I don’t know. But I know that era of engines had several different ignition setups.

mFm;
It would appear the CDM replacement is often referred to as the "RED" stator which replaced the "BLACk". Attached is a photo of my RED stator. Can you confirm that the "red" confirms my boa converted to CDM? I truly have appreciated your insight so far - THANK YOU!
 

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the MfM

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mFm;
It would appear the CDM replacement is often referred to as the "RED" stator which replaced the "BLACk". Attached is a photo of my RED stator. Can you confirm that the "red" confirms my boa converted to CDM? I truly have appreciated your insight so far - THANK YOU!
The black stator is what it would have originally came with.

The red stator was an upgraded version that does come with the CDM kit...But it will work with either flywheel. Some used the red stator without upgrading to CDM.
 

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The black stator is what it would have originally came with.

The red stator was an upgraded version that does come with the CDM kit...But it will work with either flywheel. Some used the red stator without upgrading to CDM.

I believe that to be great news. So to reiterate, yopu believe the red stater should work with flywheel #859241T10 vs 859241T18 which is out of production?
 

Jetboat Jeff

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I believe that to be great news. So to reiterate, yopu believe the red stater should work with flywheel #859241T10 vs 859241T18 which is out of production?
Oh one more thing, I belived you sent me a li to a rough diagram of differing magnet configurations utilized for single & double magnet "triggers". Can you send me that link again?
 

Jetboat Jeff

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Oh one more thing, I belived you sent me a li to a rough diagram of differing magnet configurations utilized for single & double magnet "triggers". Can you send me that link again?

Damn it - sorry - the new flywheel part # is 859241T10
 

the MfM

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Oh one more thing, I belived you sent me a li to a rough diagram of differing magnet configurations utilized for single & double magnet "triggers". Can you send me that link again?
Here is the IPL diagrams for a 93 sportjet


There are three different ignition versions (based on serial #) some of which have 2 different options.

There is also a link diagram for the CDM kit which changes quite a few components. Based on quick look of the last pic you posted it looks like you do NOT have the CDM kit based on the diagrams...the yellow fuse makes me think this. I’d compare some of the other ignition part numbers to make sure.

AE2EC471-9BBE-4471-95B6-A73A944923EA.jpeg
 

the MfM

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Jetboat Jeff

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Here is the IPL diagrams for a 93 sportjet


There are three different ignition versions (based on serial #) some of which have 2 different options.

There is also a link diagram for the CDM kit which changes quite a few components. Based on quick look of the last pic you posted it looks like you do NOT have the CDM kit based on the diagrams...the yellow fuse makes me think this. I’d compare some of the other ignition part numbers to make sure.

View attachment 118622
Thank you my friend, truly appreciate the time spent helping me. I'm gonna pull the trigger on the $550 part - yikes
 

the MfM

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No problem. Make sure to pick up some valve grinding compound to lap the new flywheel to the crankshaft.
 
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