Home Forums Chassis & Handling How to add large amount of weight to kart

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    • #62893
      Omar Calixtro
      Participant

      I am going to be racing at my track in the Yamaha Senior Y pipe class. The minimum weight is 345lbs. Together me and my kart weigh 300lbs. I am 40lbs under and there is  no lighter class and I weigh 135lbs, How can I add a large amount of weight?

    • #62898
      tony zambos
      Participant

      Cheeseburger! Cheeseburger! Cheeseburger!
      When that doesn’t work, bolt lead weights to the seat of the kart. You can buy them from kart shops. They’re available from 2 to 8 pounds. If you know of a local plumbing supply near you, they should have 5 pound lead bricks. You’ll have to drill them for a 5/8’s bolt and either double nut them or drill the bolt for a cotter key. On the 8 lb weights, you’ll probably be required to use two bolts. Most track I know of require the weights to be painted white.
      You can move the weights up or down the seat for to help in chassis tuning.

      LAD Specialties customer / tony kart / rotax / kt100

      • #62900
        Omar Calixtro
        Participant

        Cheeseburger! Cheeseburger! Cheeseburger! When that doesn’t work, bolt lead weights to the seat of the kart. You can buy them from kart shops. They’re available from 2 to 8 pounds. If you know of a local plumbing supply near you, they should have 5 pound lead bricks. You’ll have to drill them for a 5/8’s bolt and either double nut them or drill the bolt for a cotter key. On the 8 lb weights, you’ll probably be required to use two bolts. Most track I know of require the weights to be painted white. You can move the weights up or down the seat for to help in chassis tuning.

        I found some lead bricks that go up to 26lbs it is 2″ x 4″ x 8″ is there anyway something that large can be illegal?

      • #62901
        Omar Calixtro
        Participant

        Also can weight lifting weights be used just as long as I paint them white and make a new hole that is 5/8 of an inch?

    • #62917
      Steen Carstensen
      Participant

      I have used weights from a dive shop, they are covered in a yellow plastic and come in many sizes.

    • #62928
      tony zambos
      Participant

      Make sure you check with the organization that you’ll be racing with on the size of the weights that can be used and how they must be attached.
      Another option to bolting the weights to the seat is weld on tabs such as this, https://cometkartsales.com/Weld-On-Lead-Weight-Tab-Steel.html. There uses to be a perch that was bolted to the chassis frame that you could stack weight on. But couldn’t one this morning.

      LAD Specialties customer / tony kart / rotax / kt100

    • #63117
      Brock Weiss
      Participant

      Also it is better to add some small weights on the kart rather than large heavy ones so you don’t stress the seat. Try to spread them out of you can.

      We have weight in the front of the kart, on the seat, and then on the frame so the kart is balanced all around rather than having 40lbs attached do just the seat and putting all the stress on the seat

    • #63136
      Drew Grenzner
      Participant

      I’m about the same weight as you. Is it possible to use a weight in between the seat and the frame? Like a spacer?

    • #63137
      Omar Calixtro
      Participant

      I’m about the same weight as you. Is it possible to use a weight in between the seat and the frame? Like a spacer?

      What do you mean?

    • #63247
      TJ Koyen
      Moderator

      No need to use weight as a spacer between the seat/chassis.

      I’ve had to add 50lbs+ my whole life.

      Hang six 5 pound weights on the back of the seat and one 5 pound weight on each side of the seat. Make sure you do this on the scale though to make sure your weight distribution is correct. That’s the most important thing when adding weight to the kart.

      Shoot for around 42% front weight.

      Driver/Coach/Wrench : Innovative Performance/Exprit
      Owner : Oktane Visual - www.oktanevisual.com
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    • #63283
      Larry Hayashigawa
      Participant

      I run Master so 50# is normal for me.  I put 5# each under the front wings of the seat and a 10# curved diver’s weight in the middle of front of seat.  I put a 5# on each side and the rest I place on the back of the seat.  When I’m feeling anal, I put a 3/4″ washer between the seat and the weight, which keeps the contact to the seat down to a minimum.  My thinking is that clamping the entire surface of the weight to the seat will stiffen it, especially with so many weights.

      I’ve also removed two 5# from the rear of the seat and placed them on the left and right rear corners of the belly pan.  (You do need to watch the F/R balance)  This might be worth it because it lowers the polar moment of inertia and improves the responsive of the kart during turn in.

       

    • #63363
      Tim Koyen
      Participant

      Someone above mentioned 5/8″ bolts.  Don’t use 5/8″.  I think they meant 5/16″ or 8mm.  More smaller weights seems to allow the seat to flex more.

      KartLift Kart Stands
      DeepSeat Kart Seats
      877-777-8020
      ------------------
      Don't bother PMing me, it doesn't work. Email is best: tim@kartlift.com.

      • #63364
        Omar Calixtro
        Participant

        Someone above mentioned 5/8″ bolts. Don’t use 5/8″. I think they meant 5/16″ or 8mm. More smaller weights seems to allow the seat to flex more.

        Alright thanks

    • #63365
      Omar Calixtro
      Participant

      Thanks everyone for helping me out. I emailed my tech director and weight lifting weights are allowed. I also have ordered the weights and will be adding them soon.

    • #63578
      Walt Gifford
      Participant

      I’ve used 2-1/2 Lb. weight lifting weights painted white with a bushing to make the hole 3/8″ and my take is that they take up allot of space and look like crap. If you make bushing for these kind of weights make sure you put a heavy washer that covers the original hole or the bushing could pop out from vibration. Don’t put more than 5 Lbs. on a 5/16ths bolt. If you mount more than 5 Lbs. on one bolt go up to a 3/8″ bolt.

      MM

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

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