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03 Merc 125 hot start

Discussion Forum at MarineEngine.com » Mercury Mariner Outboard » Archive through July 20, 2009 » 03 Merc 125 hot start « Previous Next »

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Randy McLeod
Member
Username: capt_blind_squrril

Post Number: 4
Registered: 07-2009
Posted on Friday, July 17, 2009 - 04:34 pm:   Edit Post Delete Post View Post/Check IP

I'm gonna be working on a 03 125hp with that 2+2 or whatever they call it. Starts ok most of the time, but hot starts are a different story. Bulb is ok so fuel is good at least TO the carbs.Any help on this and/or what can be done to make this into a REAL outboard would be appreciated.
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Graham Lamb
Senior Member
Username: galamb

Post Number: 5683
Registered: 05-2007


Posted on Saturday, July 18, 2009 - 11:17 am:   Edit Post Delete Post View Post/Check IP

By "REAL" are you talking about a "full time" 4 cyliner?

If so, you can't do it. The low speed coils ONLY feed CDM 1 and 2 and the high speed coils ONLY feed CDM 3 and 4.

Now you may be able to (jump) the low speed feeds to numbers 3 and 4 as well (but then you would also need the high speed feeds back to 1 and 2 or they would be weak since 3 and 4 would be tapping their power source), but personally have never tried and suspect you would end up toasting your whole ignition because you wouldn't have blocking diodes to prevent the low speed coils from sending power directly back into the high speed etc etc

I believe you would have to retrofit a twin switchbox thunderbolt ignition and then horse around to get it to work if you want a "full time, 4 cylinder"....

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