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Thread: bully clutch spring set up

  1. #1
    4 Cycle Member
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    bully clutch spring set up

    What color springs are best for the predator 212cc stock motor.

  2. #2
    4 Cycle Advanced User
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    4 spring or 6 spring Bully?

    With a 4 spring, blue....
    6 spring, you could go either black or red, depending on weights on the levers.



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    Brian Carlson
    Carlson Racing Engines
    Vector Cutz
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    bcarlson@CarlsonMotorsports.com

  3. #3
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    Oops It's a 6 spring with 1 bolt in each lever.

  4. #4
    4 Cycle Advanced User alvin l nunley's Avatar
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    The correct springs and weights are the ones that hold the engine at peak torque on the starts. A bathroom scale between a strong wall and the front end of the kart is one way of measuring if the clutch is holding the engine at peak torque. The scale will measure its highest readings when the clutch is holding the engine at peak torque.

  5. #5
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    Considering that your motor is stock....that means it would have a cam in it best designed to run with the governor at lower rpm.
    With only one bolt in each lever, I'd stay on black springs at somewhere around .210" spring height. Be certain that all 6 springs measure the same.

    If you decide to use red springs, you will need to add more weight to the levers and back the spring adjusters off to .240" or so.

    Again, this will get you in the ballpark. You will likely need to make minor adjustments once you get up and running.

    Blessings,
    Brian

  6. #6
    One Eye Dawg Brown Racing 15's Avatar
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    Quote Originally Posted by CarlsonMotorsports View Post
    Considering that your motor is stock....that means it would have a cam in it best designed to run with the governor at lower rpm.
    With only one bolt in each lever, I'd stay on black springs at somewhere around .210" spring height. Be certain that all 6 springs measure the same.

    If you decide to use red springs, you will need to add more weight to the levers and back the spring adjusters off to .240" or so.

    Again, this will get you in the ballpark. You will likely need to make minor adjustments once you get up and running.

    Blessings,
    Brian
    Red Springs, you will need two bolts on levers, just like Brian said.......................
    JRPW Racing
    Paid Subscriber To B4C

  7. #7
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    brian. have 2 sets brass levers for the 6 spring bully! (new) what is the application for these? john

  8. #8
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    brian . have 2 sets ( 6 ea) of brass levers for a bully! what is the application for these?( 2 hole strait levers!) new never installed??
    john

  9. #9
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    You can use the brass weights on the Jr1 clutches with red springs. I would think with straight levers, it's a jackshaft application, but who knows what the intent was when they were purchased. I use the angle levers and 2 bolt straight brass weights on our Jr1 single disc Bullys.

    Thanks,
    Brian

  10. #10
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    Governor is out and spark arrestor is also

  11. #11
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    To bring an old thread back from the dead, I am trying to set up a bully clutch for box stock as well. I was running a briggs engine with a 4 spring clutch and then switched over to the box stock class. The clutch wouldn't engage with the box stock motor. I am using blue springs with no weights. Any suggestions on what to run?

  12. #12
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    so your running a predator motor now?

  13. #13
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    Blue springs with no weights will be in the 4500 rpm range -- I'm surprised that a WKA legal flathead would like that.
    You will need to make some serious changes to a 4 spring clutch (weights and springs) to get anywhere close to engagement for a stock Predator. I'd highly recommend picking up a 6 spring Bully, black springs with weights, to get to peak torque on the Predator.


    -----
    Thanks and God bless,
    Brian Carlson
    Carlson Racing Engines
    Vector Cutz

    www.CarlsonMotorsports.com
    Carlson Motorsports on FaceBook
    29 years of service to the karting industry
    Linden, IN
    765-339-4407
    bcarlson@CarlsonMotorsports.com

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