Moderated Discussion Areas
  ContinuousWave: Whaler Performance
  Merc 4-stroke: Yammies in black disguise?

Post New Topic  Post Reply
search | FAQ | profile | register | author help

Author Topic:   Merc 4-stroke: Yammies in black disguise?
marc monreal posted 03-11-2002 11:02 PM ET (US)   Profile for marc monreal   Send Email to marc monreal  
After all the talk on 4s vs 2s, and having recently had the opportunity to use a friends Montauk powered by a Sukie 90 4s I am now considering a 4s. My question is can I use the existing harness and control box from my old Yammie 70 and adapt it to either a Merc 75, 90, or 115 4s. I've always had Yammies with the exception of one Merc. The reason for considering the Merc 4s as opposed to the Yammie is the price differential. Ihg, Tom and Bigshot any thoughts or advise on this matter ? Thanks, Marc
lhg posted 03-12-2002 12:41 AM ET (US)     Profile for lhg    
Not real familiar with this situation, but I have seen twin engine Yahama binnacle controls used on Mercury engines, somehow. Probably as a result of a repower situation, and I'll bet different cables were required. I'm sure ignition key harness is not interchangeable. Even to buy the whole Merc package new, it would be about $300 for parts. Do the labor yourself. It's easy, as the engines come with complete step-by-step instructions. Just have the dealer bolt the engine on for $75 or so. The Yamaha binnacle control is a nice unit. You should be able to sell it easily.
Dick posted 03-12-2002 11:06 AM ET (US)     Profile for Dick  Send Email to Dick     
You should be able use the Yamaha control and cables by adding Merc adapters to the engine end of them. Teleflex part #CA27319P.
You will have to use a Merc electrical harness.
jimh posted 03-12-2002 11:07 AM ET (US)     Profile for jimh  Send Email to jimh     
I have not made an investigation into this, but I would not be surprised to find under the cowling that the Yamaha and Mercury engines shared little other than the power head.

For example, the Yamaha engine will probably have electricals from Japanese makers. HITACHI is a probably source for things like tilt pump relays, etc. It would make little sense for Mercury to source components like this from Nipponese makers. They make engines and need relays and other electricals, so they would probably use those vendors in their version of the engine.

As for plug-compatible cabling, again I would expect to find that the Mercury engine would use the same approach to connecting to the remote controls that all their other engines use, and thus it would not accept the connectors used by Yamaha.


marc monreal posted 03-12-2002 08:29 PM ET (US)     Profile for marc monreal  Send Email to marc monreal     
Thank's for the input everyone. I guess I have some decisions to make.
Regards, Marc
FISHNFF posted 03-12-2002 11:13 PM ET (US)     Profile for FISHNFF  Send Email to FISHNFF     
If I remember right, my Merc starter is a Hitachi. Every part I can see with a name on it has a Japanese ring to it. The wiring may be closer than you think. My tach was reading wrong (too low) and needed an adapter (after much investigation by dealer and me) , or interpreter, so the "Japanese" Merc could correctly communicate with the "American" tach. I'm sure the neutral start could be wired for use with a Yami controller. My .02 but I like the Yami binnacle better than the Merc.

Alert/Montauk 17
Merc 90 4S

Bigshot posted 03-13-2002 11:06 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
My evinrude is a Suzuki in blue paint....literally.

Everything is suzuki except for rigging. Controls, wiring, prop, and guages are ALL OMC. Suzuki would not work.

Call Mercury themselves.

Dick posted 03-13-2002 01:04 PM ET (US)     Profile for Dick  Send Email to Dick     
The Merc 4 stroke is not a Yamaha other than the powerhead on some models. Ignition, wiring, lower unit etc are all Mercury.

As to the control cables Yamaha uses the 3300 series with 10-32 threads at each end, these can be converted to either OMC or Merc cables with an inexpensive conversion kit from Teleflex.

Don't see why a Yamaha, or any other brand of tach wouldn't work with the Merc. A Teleflex tach is universal and will work with all.

Bigshot posted 03-13-2002 02:07 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Ok let me restate this although I believe you should call Mercury and ask. I asked 2 OMC dealers and 1 Suzuki guy and they both said either. Bombardier said OMC only.

Ok I had Yamaha(morse cables) they did not work on Evinrudes because the adjustment was not on the end. Yours proabably will work but mine did biggie. Suzuki prop works but spacing is different and you need washers(weird huh?). tach will work but then you have no idiot lights for oil, check engine, etc. Key switch can be modified...but now are we really saving money?

I bought all new controls, guages, wiring harness, etc for $350 new at a surplus joint. I literally sonnected it in a matter of minutes. Everything just clipped together with a different plug for each thing. The Zuki system is like the Yamaha where everything is bullet connecters. Your prop will fit and controls should work but wiring harness and such will differ.

lhg posted 03-13-2002 08:17 PM ET (US)     Profile for lhg    
So, as Dick states, confirming what I have seen, one can use a Yamaha engine control and throttle/shift cables, with adaptors on the ends, on a Mercury. But a Mercury engine harness with key start and warning horns has to be purchased. These cost about $70.
marc monreal posted 03-13-2002 09:28 PM ET (US)     Profile for marc monreal  Send Email to marc monreal     
Great info guy's, Thank's for all the input. Decisions decisions...
Thanks again, Marc
jimh posted 03-13-2002 10:44 PM ET (US)     Profile for jimh  Send Email to jimh     
Using different brands of instruments and electrical controls leads to two areas of interconnection:

At the PHYSICAL connections, you will have to make some adaptation between different connectors and connections. In most cases is must be possible to connect BRAND-A cabling with BRAND-B motors, but there is always the issue of convenience and return on investment. If you hack up the cabling or the engine, you get a "Frankenstein" result, a system made from disparate parts.

At the ELECTRICAL level, you have to worry about interconnecting things like tilt sending units with different resistances, tachometers with different pulse dividers, etc. It may be possible if you really know what you are doing, but that is not guarantee that it will appeal to the next guy, nor will it allow the typical mechanic to help you with any repairs. If you took a mixed rig of controls and engines to a dealer the first thing they'd probably want to do is replace the off-brand part with something they're familiar with.

lhg posted 03-18-2002 08:17 PM ET (US)     Profile for lhg    
Analog instruments are the one item that are universal in their connections, as long as the engine harness has the necessary leads & sender wires.

Not so for the special LCD digital gauges.

phatwhaler posted 03-18-2002 11:09 PM ET (US)     Profile for phatwhaler  Send Email to phatwhaler     
Mercury has a history of rebadging Yamaha motors. In the 80's all of the small 2 stoke Mercs were Yamaha engined with Merc and Mariner stickers.

Post New Topic  Post Reply
Hop to:

Contact Us | RETURN to ContinuousWave Top Page

Powered by: Ultimate Bulletin Board, Freeware Version 2000
Purchase our Licensed Version- which adds many more features!
© Infopop Corporation (formerly Madrona Park, Inc.), 1998 - 2000.