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Thread: Yamastall

  1. #1

    Yamastall

    Hey everybody I need a little help. I've got a 2000 Yamaha XL 1200. The ski is stock except for primer. It ran great last year, was winterized by someone else, and this year gave the following problem. The ski will run wide open just fine at around 54-56 mph. If the throttle is released the ski dies. If the throttle is released very slowly the ski will continue to run at lower RPM's with an occasional squirt from the accelerator pump or primer if things get rough, also it won't idle. I removed the carbs to find everything very clean including the filters. The check valves in the ctr and pto pumps were busted. I installed new check valves in all pumps and verified all carb passages with compressed air. I also checked the fuel return when the ski was running to verify fuel pumping back into the tank. I reinstalled the carbs and the ski still runs the same. Any suggestions?


  2. #2
    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    Quote Originally Posted by Ski dude View Post
    Hey everybody I need a little help. I've got a 2000 Yamaha XL 1200. The ski is stock except for primer. It ran great last year, was winterized by someone else, and this year gave the following problem. The ski will run wide open just fine at around 54-56 mph. If the throttle is released the ski dies. If the throttle is released very slowly the ski will continue to run at lower RPM's with an occasional squirt from the accelerator pump or primer if things get rough, also it won't idle. I removed the carbs to find everything very clean including the filters. The check valves in the ctr and pto pumps were busted. I installed new check valves in all pumps and verified all carb passages with compressed air. I also checked the fuel return when the ski was running to verify fuel pumping back into the tank. I reinstalled the carbs and the ski still runs the same. Any suggestions?
    Is the idle to low might have to adjust idle, Should be about 1500 in the water.

  3. #3
    Hey Tech thanks for responding. I removed all the power valve caps just to make sure all was well and everything looked fine. I rotated the valves by hand and everything worked smooth. When I turn the ski off the servo rotates the valves back and forth. I also have compression of M-105 C-112 P-107. I put everything back together and took it out again. I rode it WOT for a while and then would drop my RPM down in steps to see how low it would go. Eventually it was ideling around. When I jabbed the throttle from idle to WOT the RPM's would shoot up to around 2800 and hang. I would feather the throttle and things would snap into action propelling me on up to 7k RPM and running strong. After doing this for about 45 minutes it stopped hanging and would jump to around 6k RPM right off the jab from idle. If I spend a prolonged time ideling and move to a slow cruise it will still bog sometimes which can be corrected with feathering the throttle. If I don't feather the throttle the ski will die. The idle is set at around 1400 in the water.

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