Anyone running the Honda/Huasheng 49cc without the sheet metal air deflector on head?

Discussion in '4-Stroke Engines' started by wildwestrider, Jun 8, 2009.

  1. wildwestrider

    wildwestrider Member

    Anyone have any experience running the Honda/Huasheng engine without the sheet metal cooling air deflector on the back and left side of the head??


  2. Cooking the little HS

    Hi, yeah, before i got my first HS a couple years ago, the guy I got them from tried this, it will burn the Exhaust valve, and rather quickly I hear.

    I will never try it.

  3. wildwestrider

    wildwestrider Member

    Thats a bummer. That sheet metal trim piece is cheesy looking and hiding those cast aluminum cylinder head fins.....wonder how it and the Valve cover would look in Black High Heat wrinkle paint? Might have to give it a shot.

  4. fetor56

    fetor56 Guest

    I'de like to try it but i'm not prepared to risk either my Honda or HS engine simply as a cosmetic experiment.........we need a rich(or dumb) Newbie. :grin5:
  5. Mountainman

    Mountainman Active Member

    hi Brian -- looks are not everyTHING

    engineered on there for a very good reason

    when it comes to running nice and tight -- looks are not everyTHING

  6. HoughMade

    HoughMade Guest

    A guy could weld, braze or bolt faux fins on the cover. I thought about it, but I just don't care that much anymore.
  7. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member

    Are you calling RATRODER a newbie or dumb?

    PS: He is a mod and could award you a few infraction points for this personal attack :devilish:
    Last edited: Jun 9, 2009
  8. fetor56

    fetor56 Guest

    Your kiddin right...since where on this thread has RATRODER's name even previously been mentioned ONCE.
    Appropriate rebuttal quotation:
    Never argue with an idiot.They drag you down to their level,then beat you with experience.
  9. HoughMade

    HoughMade Guest

    Hey, hey relax. The reference was to the attached pic showing RR's bike without the air deflector.
  10. loquin

    loquin Active Member

    the cover is intended to force air over the head/cylinder. If you don't have it, the head & cylinder will get hotter than it should... maybe much hotter.
  11. fetor56

    fetor56 Guest

    Bad taste & bad form trying to put words in OTHER peoples mouths.
  12. Nitrohorse

    Nitrohorse New Member

    I do not use the tin that would run across the exhaust port.
    Reason is that I'd rather have cooler ambient air flowing over the exhaust valve area than the preheated forced engine air. These engine were designed for stationary use, hence the cooling fan and duct work. At 20+ mph, the cooling effect on the exhaust side of the engine is more efficient than the shrouded air.
    Have you ever seen shrouding on a 4 stroke motorcycle engine?
    I have over 630 miles on my 4 cycle and no burnt valves or loose exhaust seat, so I' guess I'm the proverbial "dumb newbie"
    A more credible concern for those of you who have 4 strokes is to change the oil and adjust the valve
    lash regularly.
    Just my opinion....
  13. wildwestrider

    wildwestrider Member

    I actually wondered if these might have been designed with a stationary engine probability in mind. I ride BMW air/oil cooled bikes....learned 15 years ago to start them and go sitting and "warming up".....the exhaust pipes will actuall begin to glow like blacksmith's iron in a furnace if an oilhead BMW is left idling (noticeable at night).

    Looking at the Huasheng, I notice that the shroud will have the effect of pushing the fan driven air FORWARD which in my mind, as the bike is moving forward,....air exiting the front of the engine will be doing battle with the air trying to move over the engine from front to back as the bike moves forward through that ambient air.

    I think I will do some testing with my laser digital no-contact temp gun when I get it running. Head temps moving and sitting still with the shroud and then temps with the shroud/deflector off (not sitting still for long).

    I think this is information we will all be interested to see. If I melt a cylinder barrel.....not the end of the world as the entire engine is what.......$150 (or less?) plus shipping??

    I believe I will leave the shroud in place for the first couple of hundred miles....maybe 500 to have more consistent temps during break in.

  14. HoughMade

    HoughMade Guest

    I agree as to the piece under the exhaust and I do not use that either.
  15. wildwestrider

    wildwestrider Member

    I Dont have a piece of sheet metal under the exhaust. The cylinder head is fully exposed on the front of the engine where the exhaust exits. Is this different from what you guys have?
  16. Nitrohorse

    Nitrohorse New Member

    Wildwest, We are talking about the same shroud piece.
    I'd be curious to see your laser temp. readings.
  17. Nitrohorse

    Nitrohorse New Member

    Your build is really nice. I think you did a great job replicating an old board track bike.
  18. wildwestrider

    wildwestrider Member

    Houghmade, Pics I have seen of your bike show the sheet metal shroud is still in place (On the left side of the head behind your copper-tubed pump gizmo)

  19. HoughMade

    HoughMade Guest

    It is. The engine also came with a piece that was held in place by the the muffler bolts on the front. that is what I gone.

    The metal piece on the left curves around the back. That, as you noticed, is still there.
  20. Old Bob

    Old Bob Member

    Thats it right there, the GXH50 was designed as a stationary engine. On a vehicle with air flow you don't need the shrouds.
    A header type exhaust with a remote muffler takes a lot of the heat away from the engine, the stock muffler holds heat near the head.