Home Forums Chassis & Handling Middle bearing question

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    • #66252
      Daniel White
      Participant

      I race Yamaha and use a 50mm axle (if that makes a difference).

      Is there a handling difference between merely zip-tying the middle bearing and removing it altogether?

       

    • #66262
      TJ Koyen
      Moderator

      Nope.

      Driver/Coach/Wrench : Innovative Performance/Exprit
      Owner : Oktane Visual - www.oktanevisual.com
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    • #66284
      Gary Lawson
      Participant

      About 2 pounds if you take it out. Otherwise no.

    • #66289
      Matt Martin
      Participant

      Without the hanger there, you’d get rid of parasitic losses from the bearing having to rotate.

    • #66301
      Daniel White
      Participant

      Thanks for the replies.

      So if it were you (or me), a 5-11, 162-ish driver racing Yamaha spec pipe / can, would you take out the middle bearing or leave it in?

      When I got the kart, I took it out, but my racing friends tell me to put it back in. Their argument is that having it in gives me more tuning options. My counter to that is if I want to tighten up the rear, I can

      1. narrow the rear track
      2. tighten the bolts to my rear bumper
      3. install my rear torsion bar

       

    • #66310
      TJ Koyen
      Moderator

      Well option 3 should be the very last resort on any kart. 99% of people throw out their rear torsion bars.

      I like having it in because it’s a quick little adjustment to see if you need to go stiffer on the axle. Put the bolts in and see if the slight stiffening helps the kart.

      Options 2 and 3 on your list involve stiffening the actual frame from tube to tube. I like to have an option to stiffen the axle too, as that can have a different effect to stiffening the actual frame.

      Driver/Coach/Wrench : Innovative Performance/Exprit
      Owner : Oktane Visual - www.oktanevisual.com
      www.facebook.com/oktanevisual
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    • #66836
      Walt Gifford
      Participant

      If you have a hard high speed braking zone, the rear of the kart might go all wonky without the middle axle bearing depending on the track and traction you might flip.

      FAA certified jet engine and aircraft technician,
      Nicholson Speedway class champion 2001,
      Yamaha KT100 Service Center,
      41 years karting experience

    • #66871
      TJ Koyen
      Moderator

      If you have a hard high speed braking zone, the rear of the kart might go all wonky without the middle axle bearing depending on the track and traction you might flip.

      I seriously hope that’s a joke Gif.

      Driver/Coach/Wrench : Innovative Performance/Exprit
      Owner : Oktane Visual - www.oktanevisual.com
      www.facebook.com/oktanevisual
      www.instagram.com/oktanevisual

    • #66994
      Daniel White
      Participant

      I haven’t flipped, but I will say that my local track has a hairpin-ish turn, and I swapped ends three times this past weekend. The kart didn’t swap ends on initial braking, but late in the zone, just before turn in.

      Now, perhaps this was because I may have started the turn before my kart had slowed enough, but I’ve driven this track for eight years and have rarely had this much trouble.

      Maybe the middle bearing, even just zip tied, provides a bit more stability under braking, no?

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