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What's with WHEEL SPIN in nuetral? xj750 Maxim

Discussion in 'XJ Technical Chat' started by 750MaximSeattle, Jul 11, 2019.

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  1. 750MaximSeattle

    750MaximSeattle Member Premium Member

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    With bike on center stand, when the bike is started after sitting cold then the rear wheel spins slowly until bike warms part way up (1-2 minutes). My previous Maxim's tended to do this. Don't know the cause, but I use Castrol 20w50 4T (motorcycle engine oil for these "wet" clutches) and just changed both oil and filter. Previous oil change was done a year ago, and I rode just over 1,000 miles between oil changes.

    A potential buyer wants to know.
    IMG_6844.jpg
     
    Last edited: Jul 11, 2019
  2. squidx85

    squidx85 Member

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    I think it's just an effect of the viscosity of the oil on adjacent moving parts. If you look at a 4wd pickup, if the transfer case is in rwd, hubs unlocked, on mine even with synthetic oil, the front driveshaft still spins a little. You can grab the shaft by hand and stop it, or spin it when the truck isn't moving.
     
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  3. Toomanybikes

    Toomanybikes Well-Known Member

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    Totally agree with @squidx85 . Cold thick oil will want to turn the gearbox. Both my xj’s and my cb900 do this. Also proves that brakes don’t drag and all bearings in good shape.
     
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  4. XJ550H

    XJ550H Well-Known Member Premium Member

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    it is normal bikes do it more so when oil is cold.

    I can feel the drag in neutral when I try to roll bike before it is started when its warm all gone
     
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  5. Franz

    Franz Active Member

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    Is this the basic principle of torque convertors I wonder?
     
  6. k-moe

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

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    Essentially.
     
  7. Franz

    Franz Active Member

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    So the hydraulic forces are much stronger in a torque converter. it is the same principle as pascals law?
     
  8. squidx85

    squidx85 Member

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    I think pascal's law is 'the same pressure exists everywhere in a confined system'. Explains how your brakes use a hydraulic form of mechanical leverage, ratios of surface area. I have a hard time picturing how a torque converter works internally, but what I've always heard is they're like 2 fans aimed at each other. Change the blade pitch and you can actually multiply torque with a fluid coupling, which I guess torque converters do.

    Yes, I am a nerd, but I'm also a high school dropout.
     
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  9. JBurch

    JBurch Member

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    It's fluid drag, even though it's in neutral, the input shaft is spinning and thus all the gears within the transmission, it just shows how slippery the oil is not.

    the vanes inside a torque converter are actually turbines, one is stationary, the other moves, fluid under pressure moves across the stationary blade to the rotating blade causing it to move, angle of the fins alters your torque multiplication and thus your "stall"
     
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  10. Cattleman XJ

    Cattleman XJ Member

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    Is the potential buyer new to motorcycles?

    Every bike I’ve ever had had some rear spin in neutral when on a stand
     
  11. XJ550H

    XJ550H Well-Known Member Premium Member

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    only people who use centerstands would know that:)
     
  12. MaximusXJ650

    MaximusXJ650 Member

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    Mine doesn't spin in neutral, you make me worried ha ha
     

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