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  1. #1
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    old and new electronics swap over

    I have a newer 2003 150hp o ring head 2.5l engine with cdm ignition with a blown cylinder, I also have a 1998 200 2.5l with traditional switch boxes and coils with non oring heads, can the newer igniton be swapped over to older power head as one stlye head uses a non gapped plug on older motor and newer engine uses gapable plug so if I did swap newer igniton with cdms to older 1998 powerhead do I use gapable plug or non gapable plug and is or does carb jetting change, always replace and repair by serial number never tried this, thanks

  2. #2
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    ya got some "fab" work ta do. all tha mounting bosses for coils, regs, boxes etc. are different............

  3. #3
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    Great question- I have been considering doing the same on a real sweet '95 XR6 I have- please let us know how this goes if you do this.
    I have multipule spares with which I could do this.

  4. #4
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    the swap will have to include the flywheel
    the trigger magnet setup from the cdm style is different
    so flywheel, timer base, ignition box and the cdm boxes all together

  5. #5
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    Great info Ronnie...did not realize the flywheel trigger magnet setups are different. That might catch some by surprise.
    Go Time
    2003XS GS 225 Promax/ 260 / 280
    26 Regulator twin 250 EFI

  6. #6
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    i did not get that from your post
    they are both CDI ignitions
    so gapless sparkplug or ground electrode does not really matter
    only the heat range
    personally i like to use the ground electrode they seem more resistant to plug fouling
    as long as you run the same advance everything stays the same
    i am assuming your friend is not trying to run carbs from the 150 on the 200?

    check page 71 of the guide!
    Attached Thumbnails Attached Thumbnails CDI+Troubleshooting+Guide+-+2012_1.pdf  

  7. #7
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    Ronnie, tha difference is tha cdm ('lectronic) motor has a ecm ('lectronic) on it. that's supposedly tha reason for resistor plug.........I think.
    Last edited by tlwjkw; 01-28-2015 at 02:26 PM.

  8. #8
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    CDM system has only a little control module the size of a pack of cigs- and the CDMs - that is about it- which is why a few of us simple folks likem-
    857185T 1 1 CONTROL MODULE

  9. #9
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    i am assuming we are talking about this engine

    because trying to mount the Motorola ecu
    from the X and XS engines is going to be a nightmare
    and i would not call these CDM units but they have induction ignition
    not capacitive discharge
    i am pretty sure the only ecu controlled CDM capacitive discharge ignition engines were the 3 liters with 2 ecu,s fuel and ignition

    but now i am totally confused about what is getting build on what

    i think our mastertech needs to be a bit more clearer
    Attached Thumbnails Attached Thumbnails mercury_cdm_2.5ltr.pdf  
    Last edited by PanRonnie; 01-28-2015 at 02:44 PM.

  10. #10
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    Early CDM 2.5s are what Ronnie has the drawing of. They are the first engines with oring heads, EFI and all carb CDM models. Only late model 2.5L EFI engines with electronic oil injection (like the 225X) have the ECM.
    Go Time
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  11. #11
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    yep that would be him- I have 2002 and a 2004 that have the same system- and use same part numbers

  12. #12
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    Quote Originally Posted by CircleHook View Post
    yep that would be him- I have 2002 and a 2004 that have the same system- and use same part numbers
    they are carb units

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    not ta worry. without some extensive bracket and/or attachment point fabbin' it ain't gonna happen.......look at it this way also. with tha switch box stuff there's nothin' ta limit how hard ya wanna turn it ...........

  14. #14
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    2003 150 xr6 carb ignition swapped over to a 1998 200 carb engine that has older magneto coils switch boxes etc

  15. #15
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    Quote Originally Posted by MrBridgeport View Post
    2003 150 xr6 carb ignition swapped over to a 1998 200 carb engine that has older magneto coils switch boxes etc
    should be no problem
    but like tlwjkw said
    the ignition module has a rev limit built in
    and you may want to swap out the exhaust cover if you want to use the CDM mounting holes
    and since you can set the spark advance to where you want it!
    Attached Thumbnails Attached Thumbnails Schermafdruk van 2015-01-29 10:24:16.png   Schermafdruk van 2015-01-29 10:25:22.png   Schermafdruk van 2015-01-29 10:28:17.png  

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