Best Huangsheng49cc 4 stroke transmission?

Discussion in '4-Stroke Engines' started by Wolfie, Jul 16, 2012.

  1. Wolfie

    Wolfie New Member

    Hey Everybody, I've built 3 nice motorbikes now, and have gotten them to be very reliable aside from one key part - the transmission.

    The transmission that came with my kit is only marked with an "XHD", and these tend to fail at ~ 100 miles or so (have gone through at least 6 of them now).

    I tried an upgrade to a 4G Grubee belt-drive, only to find its fatal flaw - a one-way bearing that lasted all of 10 miles before failure. Junk!

    Has anyone found a reliable transmission that works with the Huangsheng 49 cc 4 stroke?

    Has anyone tried the Qmatic from EZ Motorbike? Is it easy enough to install and does it work with the centrifugal clutch?

    Has anyone tried the no-name transmission from Kingmotorbike? What size rear sprocket did you use? Do you find the transmission reliable?http://www.kingsmotorbikes.com/49cc_4stroke_transmission.html

    Would sure appreciate some sharing!
     
    Last edited: Jul 16, 2012

  2. birdmannn101

    birdmannn101 Member

    Wolfie, I was planning to get the Grubee SkyHawk 4G T-Belt Drive V-Mount Kit, With HuaSheng 49cc Engine from King. Is this XHD the same thing you ended up with in your kit from King?
     
  3. Wolfie

    Wolfie New Member

  4. The_Aleman

    The_Aleman Active Member

    You can weld that 4G's one-way bearing or disassemble it and fill it with JB weld. Several members have done either mod with success.

    Not all 4Gs have that one-way bearing, either. You'd have to contact the seller to find out if it's a solid pulley model or one-way bearing equipped.
    If it's for the "tapered shaft" Huasheng with built-in clutch, I believe all of those are one-way bearing models.

    The Q-matic does not work with the "tapered shaft" engines, including the Titan. The gearbox you guys are looking at is the "pocketbike" transmission. Dax also sells one.
    That gearbox has no provision for an internal idler, so the internal chains will get loose. The long-term reliability of that gearbox is still an open question.
     
  5. Bob Mac

    Bob Mac Member

    Let me say this once. EZ motorbike
     
  6. birdmannn101

    birdmannn101 Member

    I thought that the one-way bearing problem had been resolved in this kit. Thanks for the heads up...Dan
     
  7. The_Aleman

    The_Aleman Active Member

    I'll say this, for the second time in this thread: The Q-Matic does not work with tapered shaft engines. :rolleyes7:

    Until EZ Motorbike figures out how to get one to work with tapered shaft engines, owners of those engines are out of luck.
     
  8. Barry

    Barry Member

    I do have one of the gearboxes shown in the Kings ad. It came with the HS 5G kit I bought from Spookie Tooth, installed on a Schwinn Crusier and I've only put 40 miles on it but, works great so far. As to the 4G one-way bearing, I have mine on the work bench letting the JB Weld set up. More to follow on that.
    Barry
     
  9. Wolfie

    Wolfie New Member

    Thanks for the reply Barry. What size sprocket do you make use of with the gearbox from Kings? I tried to make use of a 48-tooth, but found it too be too high of a gear ratio (I think.., meaning the engine revved too high and the bike went too slow). I just received a 36-tooth and plan to put it on today...

    Anyway, what size rear sprocket are you using?
     
  10. birdmannn101

    birdmannn101 Member

    Barry,

    Since that one-way bearing is still being sold with the kit from Kings, could you post some pictures of the bad bearing and how your fixing it with the JB Weld?

    Dan
     
  11. Barry

    Barry Member

    I'm running a 42 tooth that hauls my fat butt (265#) down a flat stretch, no wind, 90 degrees, @ 28 MPH full throttle.
    Barry
     
  12. Barry

    Barry Member

    One-way bearing/JB Weld

    Here's what I did: Popped out bearing retainer snap-rings, blobbed on the JB Weld, let set under a heat lamp for two days, and reinstalled. Just came back from a 3 mile full bore run and (knock on wood) works like a champ.
    Barry
     

    Attached Files:

  13. Wolfie

    Wolfie New Member

    I've got few updates:
    1. The 36 tooth sprocket doesn't quite cut it for me - gear ratio is still a bit high, and I have no hills to worry about. I've got a 31 tooth sprocket on order from King's Sales and Service
    2. 4g transmissions seem to be out of stock everywhere, which leads me to believe I'm not the only one trying to find alternatives for crappy 4-stroke motorbike transmissions
    3. The Qmatic now has a model that works with the HS 142-F tapered shaft according to Terry Blow, and I have one on order from BlowbyU. Its spendy though - $305 to get it to my door. Can't wait...
     
  14. Barry

    Barry Member

    Wolfie,
    I have one 44 tooth and one 48 tooth sitting on my workbench. If you think one of these might suit your purpose, send me your mailing address and I'll ship it out to you.
    Barry

    brthornton@yahoo.com
     
  15. Bob Mac

    Bob Mac Member

    With a q matic you might have to go to a 56 or 60 tooth. I have a 60 tooth on mine and a 26 inch tire. Top speed at 7400 rpms is 35 mph.
     
  16. BigBlue

    BigBlue Active Member

    Wolfie,

    keep us posted on the Q-matic with tapered shaft. I hadn't heard of an announcement by Quenton. He's usually good about making product announcements, unless Terry is making some mods to the standard transmission.

    Chris
    AKA: BigBlue
     
  17. zwebx

    zwebx Member

    i have a 48 on mine, for flat riding it sucks, for hills i have not find one that i cant pedal up with the engine (and i live at places that cars scrape there bumpers going up and down (mainly the lowered ones but still putting things into perspective)
     
  18. birdmannn101

    birdmannn101 Member

    zwebx ... A note from Quenton on what size sprocket is required with the Q-matic - "Primary is 2.76 X 1 and requires a 56 tooth or larger to maintain a good over all ratio [15.45 X 1]. Smaller than a 56 tooth won't work."

    Wolfie ... I talked to Quenton earlier and he said that he has an adapter that will fit the tapered shaft. Quenton said, "The Q-Matic will fit the HS 142F [5/8" shaft], Honda GXH50, HF 79 CC, and the HF 99 CC motors. They are currently offering the Q-Matic with a custom crankshaft adapter to fit the HS 142 with the tapered shaft. The adapters are currently made per order and normally requires a week to complete as they aren't a current production item.

    Dan
     
    Last edited: Aug 1, 2012
  19. zwebx

    zwebx Member

    who do i have to chat to to find out about where to get the q-matic?
     
  20. BigBlue

    BigBlue Active Member

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