Best gearbox to replace hoot

Discussion in 'Hubs, Gearboxes, Sprockets and Chains' started by bdial, Sep 10, 2011.

  1. bdial

    bdial New Member

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    I have an HS 4 stroke with the "new" single chain hoot. I keep burning up clutches. I would like to replace the hoot with a good gearbox...durability is more important than price. I understand that my motor has a short shaft and that limits my possibilities. I've researched the forums and haven't really found a good answer to my question. Don't mind being contacted by vendors if there is an answer to my problem.
     
    #1 bdial, Sep 10, 2011
    Last edited: Sep 11, 2011
  2. The_Aleman

    The_Aleman Active Member

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    Burning up clutches? What ratio is the gearbox and what sprockets are you using?
     
  3. bdial

    bdial New Member

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    The gearbox is the single chain hoot (new hoot) and I'm told it's 3:1 or 4:1. Rear sprocket is 44T (Grubee GT1 bicycle). I think I'm burning up the clutches because I don't run the motor wide open. I live in a small village and use the bike for cruises around town and to the post office, etc. I think the centrifugal clutch never fully engages.
     
  4. The_Aleman

    The_Aleman Active Member

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    You got it. If you have a 4:1, the clutch won't fully engage until roughly 13MPH. If you have 3:1, then 17MPH.
    You could use a larger rear sprocket or of course, a different gearbox.

    I'd recommend a 5:1 4G.
     
  5. bdial

    bdial New Member

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    Good information. Thank you.
     
  6. bdial

    bdial New Member

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    Aleman:

    I'm having difficulty finding a vendor who sells the Grubee 4g alone, i.e., without the complete kit. Any recommendations?
     
  7. The_Aleman

    The_Aleman Active Member

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    I would try calling the good people at bicycle-engines.com and asking them. 1-800-514-8435. They sell the "Honda" 4G by itself, I'd imagine they'd also sell the regular 4G that you need.
     
  8. bdial

    bdial New Member

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    No joy at Bicycle-Engines.com. I'll keep plugging away at it.

    Bill
     
  9. The_Aleman

    The_Aleman Active Member

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    Sorry I can't help with the HS 4G. It seems no one is carrying the gearbox by itself anymore.
     
  10. scotto-

    scotto- Custom 4-Stroke Bike Builder

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    I agree with Aleman, the 4G would be the best choice imho and would further bug bicycle-engines.com a bit more as they used to sell them stand alone not too long ago. I've had no probs with them and would recommend you give them another try.....it's worth a try, good luck.

    dnut
     

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