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Can I mount my own 115hp 4stroke on my boat

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  • Can I mount my own 115hp 4stroke on my boat

    I bought a 115hp 2003 4 stroke with 40 hours on it. I gut all teh parts that come with it, both gauges, all cables etc. This motor has already been ran for 40 hours already. There is one marina I want to mount the motor but the guy is not a yamaha dealer and says you need some kind of computer to mount this motor as it just wont work right if you mount it on. I dont understand, if I bolt it onto the back of the boat attach all the gauges with the factory plugs and power the motor to the battery whey wouldnt it work?

    Any ideas about what this marina may be referring to?

  • #2
    Gas in the engine oil of the Yamaha F115 is a very common problem. The problem caused both my F115 motors to wear out and there several other similar extreme cases similar. I have found the fuel filtration on these motors to be totally inadequate for EFI resulting in particles getting into the injectors. The injectors then leak fuel into the cylinders when the motor is turned off. The motors have another problem which is inadequate cook off especially when *****ing a lot. Yamaha's band aid fix is to fit a 10 micron prefilter/water trap before the motor. Proper automotive EFI and Honda outboard EFI have a final 5 micron pressure filter before the injector rail. I believe the filtration is not suitable for the purpose intended and the motor is not suitable for lots of *****ing. Please post your findings. Attached is some more reading for you:

    http://www.fishingworld.com/Discussi...tID=0000008469
    http://www.iboats.com/cgi-bin/ubb/ul...;f=30;t=003494
    http://www.iboats.com/cgi-bin/ubb/ul...;f=30;t=003628
    http://www.iboats.com/cgi-bin/ubb/ul...;f=30;t=004134
    http://www.iboats.com/cgi-bin/ubb/ul...=003461#000006
    http://www.iboats.com/cgi-bin/ubb/ul...=001021#000003
    http://www.iboats.com/cgi-bin/ubb/ul...=001771#000003
    http://www.iboats.com/cgi-bin/ubb/ul...=002640#000002
    http://www.iboats.com/cgi-bin/ubb/ul...=002794#000001
    http://www.iboats.com/cgi-bin/ubb/ul...;f=30;t=004148
    http://www.iboats.com/cgi-bin/ubb/ul...=001221#000000
    http://outdoorsbest.zeroforum.com/zerothread?id=146415
    http://thehulltruth.net/forums/threa...d=9333&start=1
    http://thehulltruth.net/forums/threa...=17930&start=1
    http://thehulltruth.net/forums/threa...=19269&start=1
    http://thehulltruth.net/forums/threa...27956&posts=12
    http://thehulltruth.net/forums/threa...=19269&start=1
    http://www.yamahaoutboardparts.com/c...c;f=1;t=000159
    http://www.yamahaoutboardparts.com/c...=000171#000002
    http://www.amsoil.com/articlespr/art...ard_motors.htm
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