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Tapping when hot

Discussion in 'Mechanics Garage' started by magee, May 26, 2010.

  1. magee

    magee New Member

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    My 800fi has started to sound tappy when up to temperature and I'm not sure if it's allways been like that or I'm going mad! You can here it more when you put your ear near the yoke/front end. She's done 35k maybe they all get a little noisy as they put on more miles???


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  2. 02 VFR Rider

    02 VFR Rider New Member

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    some had issuses with the cam chain tensioner, I have a 6th gen with 26,000 and the cam chain is making some noise when hot.
    I hear the CBR CCT is a better replacement.
     


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  3. magee

    magee New Member

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    Mine is a 99 fi with the gear driven cams


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  4. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

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    Have you ever had the valve clearance checked?

    Normally it's the other way around where they tap cold and quite down warm but stranger things have happened. checking valve clearance is part of routine maintenance that routinely gets overlooked.
     


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  5. Ghost_Rider

    Ghost_Rider Active Member

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    So are you saying that your bike does not make this noise when cold? I agree about checking your valve clearances. Valves usually get tighter though. Most commonly at least. Could have a loose valve, but you it would more pronounced when cold, not hot though.
     


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  6. magee

    magee New Member

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    Yes when it's cold it's fine, rode it today and noticed that it's really only when it gets hotter than about 85 degrees, below that it's fine


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  7. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

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    You did not answer the question about whether/when/if the valves have been checked.

    Some things you prove/disprove as the source of a problem before tearing into stuff. Routine maintenance, not so much. If the valves have been neglected then it's time to check them. Even if it doesn't make complete sense that they'd cause the noise.
     


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  8. adamjenkins

    adamjenkins New Member

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    Are you sure it is not an exhaust leak?? Sometimes the sound can be misleading
     


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  9. donald branscom

    donald branscom New Member

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    When a valve is tapping that is not all bad. Let me explain.
    When a valve is to TIGHT it means it is making no noise BUT it means it is not coming up all the way and touching the seat. This is the only way for the
    heat to get from the valve into the cylinder head and get rid of its heat via the cooling system and fins etc.
    If a valve is LOOSE it may tap when .001 too loose but it is not being damaged.
    It may have a little tiny bit less power and save you on gas a little tiny bit but it is not getting damaged from excessive heat it cannot get rid of.

    Now about noise in general. The longer you have ANY motorcycle you start to hear noises. It is just that when you first get the bike there is so much going on that you have to learn that you do not notice it at first and then as you get to know the bike you notice more things about it.
    If you sell motorcycles this always happens. A new motorcycle owner almost always comes back after a couple weeks and reports hearing a noise.
    But nothing is different. It is still a brand new motorcycle. But since they are not sure and it is new they will worry.

    Just make sure you adjust your valves at the intervals suggested in the workshop manual. And the first 1500 miles is the most important.
    That is when all the metals of the engine are adjusting to the heat.

    That is why I like rebuilt engines. When you rebuild it and machine it. you know that the metals in the engine have already made all the changes . And the engine will be not need to adjust the metals are stable.
     


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