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O\04 yamaha xl 700 overheating rebuilt carb, new

O yamaha xl 700 overheating rebuilt carb, new fuel
dealership took jets out, exhaust manifold and back flushed and found no problems
take the heat sensor off and it runs good, just runs hot
engine has good compression

really baffled about this one

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  • Ian Summerfield
    Ian Summerfield Jul 05, 2010

    is this a jetski?

  • jwiggs2797 Jul 05, 2010

    yes its a 2004 xl 700

    i first thought it was fuel problems so i rebuilt the carb and put new gas

    i took it to dealership they took heat sensor off and it ran fine, but it was running hot

    they took the jets outs and they were clean
    they back flushed it and nothing was stopped up
    they took the exhuasut maifold off and it had very good water flow

    tested engine and it has very good compression

  • Ian Summerfield
    Ian Summerfield Jul 05, 2010

    has it been checked with infrared thermometer to see if its within range.does motor have its own water?how do you know its running hot?temp guage,or smells hot,or v hot to touch?water pump?

  • jwiggs2797 Jul 05, 2010

    no it dosnt have its own water
    there is not temp guage and no meter has been put on it
    the mechanic said it was hot to the touch
    it does not have a water pump

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My ski has good compression and runs good for about 30 45 mins but after that it starts to bog down?

Posted on Feb 29, 2012

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I am having the same problem. Although I do not yet have it solved, here are some things that have been recommended to me by friends and shops:
1) For me the water was coming out the front water vent holes (left and right side toward front of hull) but water was hot, not cool when I idled for long periods of time or towed tubers/skiers. The exhaust alarm for me went off about 15 mins also when idling but I could run it wide open for 20 without issue.
2) The shop recommended I flush the system to eliminate any foreign objects in the system. After removing all connections and blowing out everything going to the jet plate I flushed the system in my driveway for at least 15 mins without warm water or an exhaust alarm, but the nex ttime I put it into the water it happened again.
3) After talking further with a tech. he stated that it could be the catalytic converter is broken or clogged. Higher RPM it forces enough water past it for cooling and enough enought pressure from the exhaust thru the converter so it doesn't develop the heat issue. This logic seems to hold true.

I haven't yet tried to pull out the converter and check it for defects but that is my next option.

BTW, converters (like anything) aren't cheap! He stated they DO have a bypass kit which removes the converter and puts in a straight pipe and sensor bypass for about $200.

Let me know what you come up with if you find anything too!

Posted on Aug 16, 2010

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Change sensor

Posted on Jul 05, 2010

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A “very helpful” rating on this answer? Thanks!


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