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  1. #1

    1200R Carb query

    I am having an intermittent power loss on my 1200r.
    Today I removed the carbs cleaned and checked everthing.

    The only thing the seemed out of place was the clear plastic check valve (part no. 12 here http://www.mikuni.com/pdf/sbn_rebuild-kit.pdf). This check valve vas not sitting down on the metal face, I dont think it would be working correctly.

    Firstly what is the purpose of this check valve, and secondly what would the symptoms be i it is not working correctly.

    Help Appreciated


  2. #2
    Moderator OsideBill's Avatar
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    The check valves are what create your fuel pressure. if they are not sealing it will affect your pop-off pressure and your total metered fuel delivery. I suggest you put new rebuild kits in all three

  3. #3
    Pistonwash's Avatar
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    Quote Originally Posted by OsideBill View Post
    The check valves are what create your fuel pressure. if they are not sealing it will affect your pop-off pressure and your total metered fuel delivery. I suggest you put new rebuild kits in all three
    Yep +1

  4. #4
    Could this check valve cause the following problem.

    At WOT running fine at max revs and sudden power loss, revs drop to approx 6000 for about 2 seconds and then back up again.
    Last edited by steelroe; 02-24-2008 at 09:05 AM.

  5. #5
    Moderator OsideBill's Avatar
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    I am not sure but it is possible yes. You identified a problem that could potentialy cause a lean situation. If it is not addressed it will end up taking out you cylinder. What do your plugs look like?

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