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We,ve had this machine for about 6yrs and never have a problem. Currently has 160hrs. We took it out and ran it the for the first day of the season just fine. The next time we went out we rode for about 15 min and it died. It would just barely run with the starter turning it over and sometimes idled for a just a bit before dying. When we checked the plugs we had spark but they seemed rather wet. I never did notice if we had any temp warnings. We had 90,95, and 105 when we did the comp test. I noticed a water line at the back of the exhaust manifold were it looks like the cooling water flows out from the manifold and then back in was totally plugged with sand. Anybody know what this line would be for? We pulled the head and the cylinders look pretty good. The guy helping me feels we should put new rings and pistons in while we have it apart. I'm trying to decide with that or a remanufacted eng or could it be something else.

Thanks for your advice
 

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Good time to put new pistons and rings in, the comps getting pretty low. You should clean the carbs and fuel pump too while you have it apart and clean all the sand out of the water jackets. Also, pull off the rear stinger pipe and split it and clean out in there to remove all the sand. The hose feeds water around the engine and must be clear obviously. The temp sensor may also be an issue.
 
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