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Yamaha LS200 with a bad PTO cylinder

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  • #1

    Yamaha LS200 with a bad PTO cylinder

    I have an overheated piston on my LS2000. It is a 2001 and I am wondering what is my best option (cost wise) for repair. I have the following Ideas. Cheapest... Bore to .5 and install new piston and hope that it stays within the 8% to 10% acceptable range so all I have to buy is a cylinder kit and gaskets. Option 2.... I get a new sleeve and new piston but i am not sure if that is something that I can do my self. I mean can i take out the sleeve my self and install the new one and then the cylinder? or do i have to take it to a machine shop to do it? BTW if anyone know a good machine shope in Miami that does the kind of work that I need please let me know. Then we have option 3 that is very close to option 4 that is a complete tope end kit exchange but for a couple of hundred bucks more I will get a new engine. I am also looking for some guidance on how to do this since this is my first time repairing an engine and not replacing it.

    Thank you
    Carlos
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  • #2
    Re: Yamaha LS200 with a bad PTO cylinder

    If the cylinder has been over heated then dont just do the top end, take the complete case apart, clean the crank and inspect for damage then reseal everything using new crank seals, then repair the top end. Failing to go through the bottom end could cause the repaired top end to fail again.
    SBT Tech Support is here to help with your problems.
    We try to answer each question quickly and accurately.
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    • #3
      Re: Yamaha LS200 with a bad PTO cylinder

      Would a lean carb setting cause that type of damage? I though that the oil comes from the top of the carb to mix with the gas and lub everything. The oil is driping fine into the carbs. Also can i just clean the crank with out changing it? what happens to the balance on it when it gets overheated like that?

      Thank you
      Carlos

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      • #4
        Re: Yamaha LS200 with a bad PTO cylinder

        No the crank needs to be removed to clean it properly, The lean condition could be caused by many different things, dirty fuel system, bad crank seal, case leak, cylinder leak, intake leak.
        SBT Tech Support is here to help with your problems.
        We try to answer each question quickly and accurately.
        Please do not use Private Messaging for Tech Support, use the forums.

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        • #5
          Re: Yamaha LS200 with a bad PTO cylinder

          Yes after taking a look at the damage it was clear that it had a bad crank seal (or actually the lack of one! I am about to open the crankcase of my 7 year old SBT engine. It also has a bad seal. I am wondering why that seal goes off all the time. Now that I know what happened to the engine i can say that I know how my engine got damage. A while back I had a leak and both of my engines were submerge in sal water for like an hour. I guess the water started to rust the engine from the inside and created the len condition by rusting the wholes that lubricate the crank. I can asure you that it will not happen again. I am taking the other engine out and re sealing it with supper grey sealer to make sure it wont happen again.

          Thank you for all your help and good products. you have a loyal customer in me.

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          • #6
            Re: Yamaha LS200 with a bad PTO cylinder

            Yep, bad crank seals will cause some major issues.
            SBT Tech Support is here to help with your problems.
            We try to answer each question quickly and accurately.
            Please do not use Private Messaging for Tech Support, use the forums.

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