1. Hello Guest. You have limited privileges and you can't "SEARCH" the forums. Please "Log In" or "Sign Up" for additional functionality. Click HERE to proceed.

What's with WHEEL SPIN in nuetral? xj750 Maxim

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

Tags:
  1. 750MaximSeattle

    750MaximSeattle Active Member

    Messages:
    548
    Likes Received:
    30
    Trophy Points:
    28
    Location:
    Seattle, WA
    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

    Messages:
    40
    Likes Received:
    12
    Trophy Points:
    8
    Location:
    South Dakota
    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.
     
    Franz and 750MaximSeattle like this.
  3. Toomanybikes

    Toomanybikes Well-Known Member

    Messages:
    2,835
    Likes Received:
    814
    Trophy Points:
    113
    Location:
    Tsawwassen bc
    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.
     
    Franz and 750MaximSeattle like this.
  4. XJ550H

    XJ550H Well-Known Member Premium Member

    Messages:
    13,199
    Likes Received:
    3,854
    Trophy Points:
    113
    Location:
    Great North Woods
    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
     
    Jetfixer and 750MaximSeattle like this.
  5. Franz

    Franz Well-Known Member

    Messages:
    3,646
    Likes Received:
    1,037
    Trophy Points:
    113
    Location:
    Scotland UK.
    Is this the basic principle of torque convertors I wonder?
     
  6. k-moe

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

    Messages:
    19,613
    Likes Received:
    6,703
    Trophy Points:
    113
    Location:
    The City of Seven Hills
    Essentially.
     
  7. Franz

    Franz Well-Known Member

    Messages:
    3,646
    Likes Received:
    1,037
    Trophy Points:
    113
    Location:
    Scotland UK.
    So the hydraulic forces are much stronger in a torque converter. it is the same principle as pascals law?
     
  8. squidx85

    squidx85 Member

    Messages:
    40
    Likes Received:
    12
    Trophy Points:
    8
    Location:
    South Dakota
    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.
     
    Franz and chacal like this.
  9. JBurch

    JBurch Active Member

    Messages:
    210
    Likes Received:
    90
    Trophy Points:
    28
    Location:
    Owego, NY
    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"
     
    Franz likes this.
  10. Cattleman XJ

    Cattleman XJ Member

    Messages:
    83
    Likes Received:
    21
    Trophy Points:
    8
    Location:
    Texas
    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

    Messages:
    13,199
    Likes Received:
    3,854
    Trophy Points:
    113
    Location:
    Great North Woods
    only people who use centerstands would know that:)
     
  12. MaximusXJ650

    MaximusXJ650 Member

    Messages:
    147
    Likes Received:
    19
    Trophy Points:
    18
    Location:
    West Yorkshire
    Mine doesn't spin in neutral, you make me worried ha ha
     

Share This Page