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  1. K

    Yamaha F115TXRD 50c or 60c thermostat?

    What is the correct thermostat part # for my F115TXRD? I am in South Carolina. What thermostat would be recommended for South Carolina waters. Water temperature between 60F and 90F. Would it be the 50c (122F) or the 60c (140F)? I asked two different Yamaha parts people what part number I should...
  2. K

    Yamaha F115 Engine Zincs. How Many are there?

    How many engine zincs does the Yamaha F115 have? I removed 3 zincs and cleaned them today. Two were near the spark plugs and one is on the starboard side of the engine near the oil filter. I have attached a picture of one of the zinc after I cleaned it. Is it OK to clean it as I have done or...
  3. K

    Is this normal? Yamaha F115 Pump Housing

    I am installing a new water pump kit. To my knowledge this is the original water pump from the factory. Please look at the attached pictures and tell me if the housing looks normal. It looks like someone added some two part epoxy. It seems it would obstruct the water flow. If someone has a...
  4. K

    Yamaha F115 cooling diagnostic question

    I started my 2005 yamaha F115 on the trailer today using a flush plate. Cranked right up. No water coming out of the tell tale so I turned the engine off. I removed the foot and will install a impeller kit. Can I safely run water from a garden hose through the pick up tube while the foot is...
  5. K

    Yamaha F115 hard starting once it has been run.

    Re: Yamaha F115 hard starting once it has been run. I tried to start the engine cold on the trailer tonight. I had the Yamaha YDS cable attached to try and help solve the problem. It turned over but would not start. This it the first time it would not crank when trying to start cold. The...
  6. K

    Yamaha F115 hard starting once it has been run.

    Re: Yamaha F115 hard starting once it has been run. I received my Yamaha Diagnostic System. I have attached four pictures of info it read while running. The shift position switch reads "irregular" does anyone know what this means. Thanks, Kevin
  7. K

    Yamaha F115 rattle noise when the engine is turned off

    My year model 2001, F115 has a rattle noise every time I turn it off. It last about 1 second. I think it is normal and see some people talking about an ISC valve. If anyone knows what this is, I would love to hear an explanation. Also what is an ISC valve, where is located and what does it do...
  8. K

    Yamaha F115 hard starting once it has been run.

    I have a 2001, Yamaha F115 with 1011 hours. Three times this summer in the last 40 hours of using it has been very hard to start. This happens after running normally and turning the engine off and trying to start within 30 minutes of stopping. Today I tried a new primer bulb, portable gas tank...
  9. K

    Mercury 50elpt, 4-stroke, 1996 year, fuel in the oil

    It has a new thermostat. I removed and looked at the fuel pump. The rubber diaphram is not cracked or damaged. The engine will not idle, runs very rough. Fuel appears to be coming out of the breather and accumulates in the bottom cowl. Can a carb float that is stuck open cause fuel to get in the...
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