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  1. #1

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    50cc throttle problem

    i need a servo that will be strong enough to pull the throttle on a 50cc pocket bike engine http://www.minibikepartsnow.com/MPBN...cc/eg49cc1.jpg. would two 1/10 scale servos work if i gave it enough leverage, or what if i used a spring to assist the servo? Is there just a reg servo that is strong enough? Ive seen the wiper motor servos but i dont understand how they are wired with a reg servo as the sensor. If you know how to wire one and could explain it to me or post a pic that would be absolutely amazing!

    Please reply!
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  2. #2
    Lars from Norway's Avatar
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    RE: 50cc throttle problem

    Wow! Wiper motor? It is enough with a servo on about 6 kg as the arm is very easy to turn on the carb. Not much force needed to move it. The wiper motors that you have read about are for steering servos on really large cars.
    Find a job you love, then you won\'\'t have to work for the rest of your life.

  3. #3

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    RE: 50cc throttle problem

    it looks like that engine has a mikuni type carb on it they're a little harder to move, for $30 you could get an appropriately sized servo HERE and not have to make anything custom...

  4. #4

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    RE: 50cc throttle problem

    Replace the carb with a good walbro! It will be easier to tune, and you can use a standard servo.
    The walbro can suck the fuel from the tank, with that one the tank needs to be higher than the carb.


  5. #5
    Lars from Norway's Avatar
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    RE: 50cc throttle problem

    rangerfredbob; i overlooked that part, i know from my time driving my moped that moving the "piston" up and down inside the carb is kind of heavy compared to twist the axle in a Walbro.
    Find a job you love, then you won\'\'t have to work for the rest of your life.

  6. #6

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    RE: 50cc throttle problem

    ye it might just my motor has a hard throttle but it take quite a bit of force to pull it, one on my servos from my 1/10 rc cant do it.

  7. #7

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    RE: 50cc throttle problem

    thanks you for the advice i hope it will help

  8. #8

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    RE: 50cc throttle problem

    use a 25 kilo servo like i will be using

  9. #9

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    RE: 50cc throttle problem


    ORIGINAL: Lars from Norway

    rangerfredbob; i overlooked that part, i know from my time driving my moped that moving the ''piston'' up and down inside the carb is kind of heavy compared to twist the axle in a Walbro.
    +1

    or replace the cable/spring with a solid wire and no spring

  10. #10
    Lars from Norway's Avatar
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    RE: 50cc throttle problem

    That is a very good idea, mad maori! To move the piston itself without the spring attatched is done with little or none effort, so just using a solid rod to move it can be done by almost any servo.
    Find a job you love, then you won\'\'t have to work for the rest of your life.

  11. #11

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    RE: 50cc throttle problem

    Could anyone show me a pic or something of a servo and a wiper motor working together. I'm not too good with reading the diagrams so I need to see the actual thing, or explain how to wire it. Thanks

  12. #12

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    RE: 50cc throttle problem

    Just get a Hobbyking HV767
    http://www.hobbyking.com/hobbyking/s...idProduct=9983
    30kg/cm torque is way more than you could ever need


  13. #13

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    RE: 50cc throttle problem

    so with this walbro carb, how is the gas tank going to work, would i have to just have a hose go to the bottom and a vent on it, or would i need to creat pressure, possibly with the exhaust? how exactly would the whole fueling system work?

  14. #14
    Lars from Norway's Avatar
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    RE: 50cc throttle problem

    The Walbro-carb feeds itself with fuel, this is done via pulses from the crankcase. You will need a hose with a filter on to feed the carb (a clunk in the tank with filter on), and a hose to return the fuel to the tank. And also some sort of ventilation in the tank. No need to create pressure to make it feed from the tank.
    Find a job you love, then you won\'\'t have to work for the rest of your life.

  15. #15

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    RE: 50cc throttle problem

    oh ok i get, thanks i will be getting one shortly

  16. #16

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    RE: 50cc throttle problem

    ive been trying to find a clunk for in the tank but i cant find any, also what size hose does the walbro carb need, it doesnt say what the ID of the hose needs to be. this is the one i am looking to buy[img][/img][img][/img][img][/img]
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  17. #17
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    RE: 50cc throttle problem

    Her name was Lola. She was a show girl.

  18. #18

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    RE: 50cc throttle problem

    i was trying to find one with more of a filter on it

  19. #19

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    RE: 50cc throttle problem

    One of these should do the trick:

    http://www.davesmotors.com/s.nl/c.88...t.A/id.2632/.f
    http://www.davesmotors.com/s.nl/c.88...t.A/id.2560/.f

    Daves will also have standard fuel line for the carbs if you don't find any...

  20. #20

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    RE: 50cc throttle problem

    ive bought one like yours and started the engine if you wont i can give you the site were i bought it from



  21. #21

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    RE: 50cc throttle problem

    that looks great on there, i already found a suitable website for me though, but thanks a lot.

  22. #22

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    RE: 50cc throttle problem

    could you tell me what the inside diameter of the hos is that is required for the walbro carb?


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