Good while it lasted, Huasheng broke

Discussion in '4-Stroke Engines' started by Proboscis, Sep 28, 2008.

  1. Proboscis

    Proboscis Guest

    This is what happens when you go down a hill full throttle doing 65KM/H
    <a href="http://s35.photobucket.com/albums/d200/proboscis100/?action=view&current=DSC01521.jpg" target="_blank"><img src="http://i35.photobucket.com/albums/d200/proboscis100/DSC01521.jpg" border="0" alt="Photobucket"></a>

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    Exhaust valve shot into the bore and pitted the cylinder wall.
     

  2. skyl4rk

    skyl4rk Guest

  3. HoughMade

    HoughMade Guest

    What sprocket were you running- I'd love to figure out what RPM you were at.
     
  4. ZnsaneRyder

    ZnsaneRyder Member

    WOW! The damaged cylinder wall is visible! Sucks that the valve keeper wasn't strong enough to hold the valve in! I'm also wondering the same thing as HoughMade, about what RPM you were running. I just removed my RPM limiter on my engine, and for sure would not want that to happen!

    I also like to go down hills at full throttle, hehehe!
     
  5. ZnsaneRyder

    ZnsaneRyder Member

    Here's a deal I found on a new one of those engines:
    http://www.duropower.com/item.asp?PID=88&FID=3&level=1

    Do these engines have an RPM limiter?

    When I called their phone #, however, they couldn't answer my question about if the engine came with a centrifugal clutch or not, but just kept rudely blind-transferring me to another rep over and over. If not, at least Hilliard makes an Extreme-Duty clutch for a 5/8 shaft.

    The little engine costs more than my 196cc engine, but I'm interested to put one on a BMX/style 20" boys bike.
     
  6. Knol

    Knol New Member

    I have a Honda GX 160 with a Comet TAV on a pusher trailer. Works great up to about 35 mph on straight smooth roads. Over 40 the harmonics go all weird and the trailer tries to tear itself off the bike. I think I need a stiffer trailer.
     
  7. arceeguy

    arceeguy Active Member

    Chances are, the valves started to "float" at high RPM, and the piston slammed into the open exhaust valve.

    These engines are meant to be run at a constant low RPM, like in an edger or small tiller. The valve springs are not very strong to reduce frictional losses. You can compress one fairly easily with your fingers.
     
  8. cruiser66

    cruiser66 Guest

    That was over 40 mph! My HuaSheng/Hoot combo with a 36T sprocket does 31 to 32mph at about 7500 rpm. I think you would have a hard time doing 36 to 37 mph with a 30T at 7500 rpm. A Tiny Tach is a good idea to monitor the revs. I don't go over 7500 rpm.

    66
     
  9. fetor56

    fetor56 Guest

    Just goes to prove everything is destructable if u take it to destruction......poor little HuaSheng,that's life in the big city.
     
  10. Irish John

    Irish John Guest

    With the Grubee I can hit 80 kms \hr freewheeling but I thought if you close the HS throttle the centrifugal clutch lets go and the bike freewheels. I can't see why you'd open the throttle at a spped that the motor can't take. One of the first 4-stroke riders on this forum blew his Honda\Grubee doing the same thing and I took it as a warning that 7500 rpm is peak revs. The vibrations before it blew up must have been horrendous. You need an engine with overhead valves and a cam chain that is specially built to go to incredibly high revs but even they blow up. Mike Hailwood won the Isle of Mann on a 6 cylinder 250cc Honda back in the 1960s that red lined at some incredible rpm. You need a motor like that!
    Sinophobia (from Latin Sinae "the Chinese" + Ancient Greek φόβος -phobos, "fear") or anti-Chinese sentiment is a fear or dislike for China, its people, or its culture but particularly its engineering abilities. It is rampant on this and many other internet forums but is most prevalent among owners of HT bike motor kits.. Just read the posts here at MBc and replace the word "China" or "Chinese" with your ethnic background and feel the love! (example: Irish or Ireland, African or Africa, British or Great Briton, etc.)
     
    Last edited by a moderator: Oct 3, 2008
  11. ZnsaneRyder

    ZnsaneRyder Member

    VERY Good point. I never hated on the chinese engines, but a lot of other folks have and wrongly assume they are junk.

    I've been running my "chinese" engine WAY past the redline and run it hard for hours each day, and have ZERO issues, and it only used a slight amount of oil when new, and seeped out the oil seal, but burned NONE. I'm pleased with it and after its 3rd oil change, the engine didn't seem to use ANY oil. I'm now on my 4th oil change now with brand new oil.

    Also this is the cleanest burning small engine I've EVER owned. Never any smoke unless choked, and never an unburnt gas smell. Cleaner than many cars I've driven and owned I can assure that.

    Folks can hate all they like on the chink motors, but I'd rather pay under $200 for chinese clone and get good quality, than pay $300-400 on an expensive Genuine Honda (also made in China BTW) or overpriced & harder to repair Briggs & Stratton. Also, it's easier to replace the cheap engine if needed.
     
    Last edited: Oct 5, 2008
  12. Irish John

    Irish John Guest

    I think the agreed opinion on these pages is that the HS is a great little motor but if there hadn't been a brilliant motor to copy it from things would be very different. It's all the bits & pieces that come out of the State owned factories that are the pits. For people in the US who have access to the Honda GXH 50 at US$210 you'd be mad not to buy one and keep the HS for spares. Inside the two motors are identical so you can swap parts but the Honda has more oomph and that is a nice thing to have.
     
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