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well i checked my valves today on my xj700n.. all in spec

Discussion in 'XJ Technical Chat' started by joshs700n, Jun 2, 2014.

  1. joshs700n

    joshs700n Member

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    All within spec
     
    joshs700n, Jun 2, 2014
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  2. bmarzka

    bmarzka Active Member

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    5000 miles just flies by when you're having fun.
     
    bmarzka, Jun 2, 2014
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  3. joshs700n

    joshs700n Member

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    Just double checked all within spec!!!
     
    joshs700n, Jun 2, 2014
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  4. joshs700n

    joshs700n Member

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    Well 19k flew by and they're in spec
     
    joshs700n, Jun 2, 2014
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  5. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    One of the great advantages of shim adjusted valves is their tendancy to stay in spec for longer periods of time (particularly as the engine exceeds 10K miles). They still need to be checked on schedule though. It really, really sucks when the reason you find out a valve is tight is because a valve dropped or burnt.
     
    k-moe, Jun 2, 2014
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  6. joshs700n

    joshs700n Member

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    yeah good point my virago was out of spec by alittle and I thought it was the other way around fits makes it sound like they go out of spec really fast. my dad told me they would be within spec im glad I checked them now i know how easy it is.
     
    joshs700n, Jun 2, 2014
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  7. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Fitz makes it sound like most owners never check the valves, which is true. Most used bikes will not have ever had anhy of the required maintianance done. The main point is that you never know until you know, so get in the habit of doing everything on the maintainance schedule.
    My friend's XV920 had sero lash on the intakes when I recommisioned it at 12k miles. The valves had never been touched, even though they are easy to get to.
     
    k-moe, Jun 2, 2014
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  8. joshs700n

    joshs700n Member

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    Well I'm pretty sure mine were never checked and i got it with 18k miles now at about 20k. if your always revving at 10krpm and never cruise below 6-7k then obviously your valves will go out of spec alot quicker than if you always shift/cruise around 3-4k rpm.
     
    joshs700n, Jun 2, 2014
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  9. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    RPM has nothing to do with how fast valve lash goes out of spec.
     
    k-moe, Jun 3, 2014
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  10. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Engine operating speed has very little to do with how fast valve lash goes out of spec.
     
    k-moe, Jun 3, 2014
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  11. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    True, rpm doesn't necessarily determine how fast it will go out of spec........ but engines that are run harder will probably tend to go out of spec sooner than ones that are babied..........
     
    hogfiddles, Jun 3, 2014
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  12. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    True; but I suspect in the case of Josh's 700 that they DID get their initial 3K check.

    In most cases, the valve clearances were completely ignored. One would expect to find them tight. Once they've been brought into spec, no, they don't continue to tighten at the same rate as during the initial run-in.

    If you check them religiously every 5K miles, you end up only adjusting one here, one there and not with every check. Sometimes it's a case of check 'em, log 'em, and button it back up.
     
    bigfitz52, Jun 3, 2014
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  13. joshs700n

    joshs700n Member

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    Doesn't my valves clank up and down twice as fast if your at 6k opposed to 3k Rpm
     
    joshs700n, Jun 3, 2014
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  14. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Yes, but wear rates are not linear. Once the valve train is bedded in, the rate at which the valves go out of spec is greatly reduced.
     
    k-moe, Jun 3, 2014
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  15. joshs700n

    joshs700n Member

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    So when you reshim valves do you put them in the middle of the spec range?
     
    joshs700n, Jun 4, 2014
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  16. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    k-moe, Jun 4, 2014
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  17. bmarzka

    bmarzka Active Member

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    The spec range is .04 mm. Shims come in increments of .05 mm. If you are .01 mm below spec then the new shim will put you at the top of the range. As long as you are in the range, you're good. The only way to put it in the middle of the range is to have the shims ground.

    Darn it, K-moe. You type faster than I do.
     
    bmarzka, Jun 4, 2014
    #17

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