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Thread: Valve check

  1. #31

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    Re: Valve check

    Hmm, might be eating my words here. Drained and flushed the coolant at the same time as doing the valves. Put the cover back on (what a fiddly pain in the hoop that is) carbs on etc etc, topped up radiator and started up to settle the coolant and noticed oil coming out of cylinder four plug drain hole. Must have dislodged the inner gasket in the struggle to get the cover on. It's the plastic guard behind the rad that hinders the valve cover. Will have to strip it all out again for a look. Must remember that I haven't run it up to temp yet as had to switch off.

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  3. #32
    Supercharged Mod
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    Re: Valve check

    Bugga WW been there myself.
    Full of Hot air? Intercool yourself............ you know it makes sense

  4. #33

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    Re: Valve check

    Nice thread and interesting read for me. I've had my CBR1100XX5 from new and it's done 68.5K miles. (It's not done so much over the last 2 years owing to Stator + R/R issues which (fingers crossed) have been cured when I fitted an RMStator and an R/R which bypasses the wiring loom connection to the battery.) I've never had the confidence to do this job myself and I'm not keen on letting a dealer have a go. When I had it serviced at ~25K miles I was told the clearances were good and that because I do more long distance riding as opposed to commuting that the clearances would probably stay fine. As it's easy to do, I have changed the cam chain tensioner after it's done ~18K miles so I'm on my 4th CCT. The bike is running great at the moment and I've heard of people running Birds at high miles without checking clearances so I'm wondering whether it's worth doing?
    Trev

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  6. #34
    Supercharged Mod
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    Re: Valve check

    Quote Originally Posted by fairb View Post
    …..The bike is running great at the moment and I've heard of people running Birds at high miles without checking clearances so I'm wondering whether it's worth doing?
    I'm an engineer so I suppose I can't see the logic in running the motor and not checking the clearances knowing the damage that tight clearances can cause. That's the 'problem' with this type of motor the more they wear the quieter they get in the valve area ……… long gone are the days of 'My tappets are rattling, better check them'.

    Yes, some people never check the clearances and get away with it (60-80K miles is typically the time when the first shim changes are needed) but there are instances on this board where shim changes have been needed much earlier. So the question is really do you want to take the risk?

    WW was a Bird 'first timer' and with the exclusion of the gasket problem (it can be a real pain) it all went well and he now has peace of mind. How are your spannering skills?
    A long time ago I wrote this post https://www.cbrxx.com/engine-airbox-...tml#post177259 to show what is involved in checking the clearances. Unfortunately during a forum update all the photos were lost ….. I've reattached what I believe to be the correct photos in that post and one a few later that shows clearance checking and 'cams out' …. that might help you decide if you want to tackle the job yourself.
    Full of Hot air? Intercool yourself............ you know it makes sense

  7. #35

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    Re: Valve check

    Appreciate the reply and the points you make. I’ve just adjusted the valve clearances on my CB1000F Big One and had the cams out on it to service it’s CCT so I’ll have a go at these sorts of things. However lock-nuts are easier than shims and access is a lot better on the CB1000F. I find the Bird with its poor access and shims a bit more daunting and while it’s working well I’m thinking leave well alone. It comes down to the risk of the valves being out versus me cocking something up. However, you never know, I may work up to doing it over the winter.
    Trev

  8. #36

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    99 XX, 01 XX, 03 XX, 14 Busa, 12 ZX14R, 04ZZR1200
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    Re: Valve check

    At 115,000 I finally had to shim two intake valves on my 99XX that were at the tight side last month. Last year I had to shim one tight exhaust valve on my 01XX at 40,000 so there is no way knowing where your bike is until the first check.

    I wait until I need to a spark plug change and save some time. I'm pretty slow, so it takes me a full day from start to finish. I did a valve check on my ZX14R last year and it makes the XX seem easy. From removing the fairings to working under the mono coupe frame, it is much more labor intensive. It had 24,000 and they were all good. My Busa has also not needed a shim to date.

  9. #37

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    Re: Valve check

    I think it's down to which end of the tolerances your bike comes out of the factory, plus also usage. I've found they last till about 50k generally, even then they've been within but getting to the tighter end so I've opened them up to last longer while I'm in there.
    The answer is 42

  10. #38

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    Re: Valve check

    I asked my mechanic is the bike due to valve check/adjust, he told me he can do it if I insist but that he personally wouldn't touch it until 150k km? Bike's hitting 80k soon. How many hours are needed for this? Friend with a ZX10R said his mechanic did the valve check in 5 hrs...and his bike is "new", few years old, and then there's my old bike with million k's and my mechanic suggest I don't need it
    deadman likes this.

  11. #39

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    Re: Valve check

    Valve cover off again this morning and revealed a split gasket around number 4 plug hole. Just managed to get a honda one off of ebay for less than a pattern one. Think I am going to unbolt the rad and try to remove the plastic heat shield that sits behind it. That shield really does get in the way of the valve cover going on smoothly.

  12. #40
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    Re: Valve check

    I don't know if the carbie shield is the same as the inj one but I always pull it out before I remove the top cover. Makes getting the cover back on easier ….. but it can be a bugga to get back in!
    Full of Hot air? Intercool yourself............ you know it makes sense

  13. #41

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    Re: Valve check

    Not had a proper look, but is it a rad unbolt job to get it out? Although it was re-usable, you could feel the 'age' in the gasket. Think if I was doing it again and needed the bike back on the road asap, I would have bought one in advance just incase.

  14. #42

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    Re: Valve check

    All back on now and no leaks. The feel between the old and new gasket was very noticeable. If you don't know if your cover has ever been off and think the gasket may be the original, I would suggest getting one in on standby if you are doing this check.

  15. #43

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    Re: Valve check

    Quote Originally Posted by woodwizard View Post
    Hmm, might be eating my words here. Drained and flushed the coolant at the same time as doing the valves. Put the cover back on (what a fiddly pain in the hoop that is) carbs on etc etc, topped up radiator and started up to settle the coolant and noticed oil coming out of cylinder four plug drain hole. Must have dislodged the inner gasket in the struggle to get the cover on. It's the plastic guard behind the rad that hinders the valve cover. Will have to strip it all out again for a look. Must remember that I haven't run it up to temp yet as had to switch off.
    BTDT,

    https://www.cbrxx.com/engine-airbox-...ont-count.html


    T.
    "Stemmata quid faciunt."


 
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