Recent content by mcm114

  1. M

    Thermostat housing gasket on 91 Yam 225

    I pulled the housing on this motor, to inspect/replace the thermostats, and now I'm going to put it all back together with new gaskets. I can't tell for sure, but it looks like there was some kind of sealant used in conjunction with the old gasket. My manual doesn't specify, it says that some...
  2. M

    How to fix a jacked-up transom mounting

    I just had my friendly nearby yamaha dealer install an engine (95 yam 225) on my boat (91 ski centurion falcon). It was exactly the same overall dimensions as my old engine (91 yam 225) but for some reason they decided it would be better to mount it one notch higher on the transom. You guessed...
  3. M

    95 Yamaha 225 powerhead break-in

    Ok, I just bought this engine that came with a rebuilt powerhead and refurbished lower unit. I put 2 hours on it so far following the break-in procedure using a 50:1 ratio in the tank. (It has the precision blend injection system working as advertised.) Is there any reason that a combined...
  4. M

    91 Yam 225: Will this engine run?

    See the attached photos. You can see how the con-rod on this cylinder has carved a nice little groove into the counterbalance, and the amount of material that has been shaved off the con-rod as well. I can't imagine how that could happen, unless the rod bearing was so sloppy that it allowed...
  5. M

    Yamaha 225 rebuild...or not

    Well, not a rebuild exactly, but a complete powerhead replacement. This is a 91 with almost 1200 hours on it. The cylinders have been bored at least once already (only on one bank for whatever reason) and now the sleeve is too thin to bore them any further. I haven't looked at it myself, but...
  6. M

    Yamaha 225 2-stroke power problem

    I recently bought a ski boat with a '91 225hp TLRP engine. I only use it for a couple hours at a time in the morning or late afternoon. For a while I was putting 87 octane in the tank, until I started getting power fluctuations at all rpm ranges. When that started happening, I drained the...
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