Pocket bike transmission on a HuaSheng 142F?

Discussion in '4 Stroke Bicycle Engines & Kits' started by CycleRyder, Jun 23, 2017.

  1. CycleRyder

    CycleRyder New Member

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    My 4G T belt gave out on me the other day & been looking for a decent transmission for my HuaSheng 142F. Thinking of using a $30 pocket bike 'gear box' transmissions becuase they are cheap & seem easier to repair/replace if they ever fail.

    So has anyone ever hooked up a pocket bike gear box up to a HuaSheng with good results? Also which ones actualy can fit my motor? I'm looking for one that can run a 410 chain because those 415 chains seem too wide for comfort & I have a 3 wide tire on my bike.
     
  2. 5-7HEAVEN

    5-7HEAVEN Well-Known Member

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    The 5:1 pocket bike transmission will reverse engine rotation to a clockwise direction.
    If you're unwilling to turn your engine 180 degrees around, this transmission is not for you.

    Besides that, this transmission needs an enclosed 78mm clutch.
     
  3. CycleRyder

    CycleRyder New Member

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    Here's an image of one transmission I was looking at the other day. Looks like it should fit my HuaSheng engine judging by the measurements. Not 100 percent sure about the direction it's supposed to spin though.
     

    Attached Files:

  4. 5-7HEAVEN

    5-7HEAVEN Well-Known Member

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    Contact staton.com or thatsdax.com.

    One of them would know, and sell you the right parts.
     
  5. MotorBicycleRacing

    MotorBicycleRacing Active Member

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    Yes that is 76 mm and rotates the right way, however these cheap pocket bike trans tend to break.
    A 4G is a much better trans than those.
     
  6. CycleRyder

    CycleRyder New Member

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    I beg to differ. I had a 4G that broke on me twice in the same month. Had it installed correctly & engine was leveled & everything. First failure was my smaller belt pulley came loose while driving forcing my belt to come off (no thread locker in the pulley bolts? REALY?!) Next failure was the clutch drum snapped off the shaft because of from the looks of it crappy tack welding & seems to be made of what looks like flimzy brass. At $140 for the transmission by itself the 4G hardly seems worth it IMO.

    At least a pocket bike transmission is cheap, simpler & probably easier to fix & modify. I was thinking of going with that pocket bike transmission & making some hardware improvements to it using Staton Inc. parts like a better quality clutch drum & better made internals & better quality nuts & bolts. Would still be much cheaper than getting another 4G.
     
  7. 5-7HEAVEN

    5-7HEAVEN Well-Known Member

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    I also disagree about cheap pocket bike transmissions being unreliable. Some have noisy straight cut gears. In 8 years, I've never had a faiil.

    Just be sure to open the trans and grease the internal gears.
     
  8. MotorBicycleRacing

    MotorBicycleRacing Active Member

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    You are talking about a different 5 to 1 trans which are very reliable but reverse the direction and are much wider.

    The type of trans in the pic above we are talking about use a light weight chain with no ability to take out the slack.
     
  9. CycleRyder

    CycleRyder New Member

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    I suppose it is possible to replace the light weight chain with a better heaver duty chain & as for the slack I could drill a hole & bolt up an idler to the inside of the casing to adjust chain slack. If the bell housing is faulty it seems like it (unlike the 4G) can be replaced with a better one from Staton Inc assuming the bolt hole is the same size.

    I cant reverse engine direction on my bike because I still want & might someday need full operation of the pedals & to reverse engine direction with a gear pocket bike transmission would force me replace the pedals with the direct drive.
     
  10. 5-7HEAVEN

    5-7HEAVEN Well-Known Member

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    The pocket bike trannies which do not reverse direction are the 3.19:1 and the CVT. All 3 items are OEM equipment. If they had failure issues, they wouldn't be standard equipment on thousands and thousands of pocket bikes.

    Sometimes one finds oneself in uncharted territory. If I were me, I'd contact Dax and Staton. I'm sure they've come across this dilemma before.

    In fact, Dax is offering his own fabbed CVT for $99. Ask him if it'd fit your needs:
    http://thatsdax.com/

    If you're the daring type, you could DIY with one of those pocket bike tranny options.

    JMO, reversing engine locations has its benefits. If the 5:1 box fits, it'll align with a driven chainring sprocket. Then you'll have the makings of a simple multi-speed shift kit.

    However, your 4-stroker would be mounted 'way off-center.
     
    #10 5-7HEAVEN, Jun 28, 2017
    Last edited: Jun 28, 2017
  11. CycleRyder

    CycleRyder New Member

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    So has anyone ever thought about or tried converting a Grubee 4G into a chain drive transmission? I was thinking of giving it a try myslef to see if I can make a more reliable easier to work on 4G. From the looks of it based on my broken 4G, the shafts are both the same bore size on the 80T pulley & the smaller pulley. So I think it would just be a matter of swapping the pulleys out for keyed sprockets (possibly high quality ones from staton inc if they got the right sizes) & the belt drive replaced with a heavy duty chain. I also want to convert the crappy tack welded clutch drum/shaft to a more modular higher quality setup so the clutch drum will pretty much never fail & if it does fail it would be easier to fix.
     
  12. 5-7HEAVEN

    5-7HEAVEN Well-Known Member

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  13. CycleRyder

    CycleRyder New Member

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    Decided to return the pocket bike transmission I got for $27. The quality was a joke & couldn't find a sprocket for the 415 chain that pared up with the shaft on the transmission. Plus the gears & chain inside seemed pretty flimsy definitely wouldn't hold up at speed of 35 to 40 mph.

    I'm going to swap out my 4 stroke for a good 2 stroke & get the best quality 2 stroke parts I can find. Would need to fabracate or get custom mounts to get the chain to clear my wide rear tire though but the faster speeds & simple engine/transmission would be woth it. What I love about 2 stroke transmissions compared to 4 stroke transmissions is no crappy bell rotor & very simple design using two gears & if greased & taken care of can outlast most 4 stroke transmissions.
     

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