Wonder it I'm in trouble or not??

Discussion in '2-Stroke Engines' started by geebt48cc, Nov 16, 2010.

  1. geebt48cc

    geebt48cc Member

    Hey there,

    Well, today I took the head off the top of the engine to take the studs out and a few drops of JB Weld. Ok, checked everything, and all looked good, but I found a spot on bottom ware the chrome has chipped off + a vertical scratch running top to bottom of the inside of cylinder chamber? MMmmm, it's never ran as well as it's running now.

    So, wonder what I should think or do, if anything? Year old..48cc Skyhawk with chrome sleeve with 350 miles.

    Glen
     

  2. hurricane

    hurricane Member

    if it aint broke dont fix it, otherwise just buy a spare and replace it . these things are so cheap i cant understand why so many people put so much effort into repairing these Ht engines.

    But they are fun to understand small motors, so im guilty also of some repairs.
     
  3. geebt48cc

    geebt48cc Member

    Yes, I very much agree!~It's just fun to see how long one can make one of these little "CHINA WONDERS" to last?

    Just wonder if it will stay the same for at least a few thousand more miles or just head south to the trash??????????? I mix 32:1der

    PS-Wonder best place to buy new jug?-----Maybe steal sleeve insert also?
     
    Last edited: Nov 16, 2010
  4. hurricane

    hurricane Member

    LOl Gee, i am so unconcerned about my oil to gas ratio as i have numerous 2 cycle engines that i own to do lawn care at home. i just guesstimate every time i fill my gas can up. It works out for me, i dont need to understand the science, just have to know it works is all. :)

    i dont know bout a jug, but just buy 3-4 of these engines and leave them on the shelf till you need the parts.
     
  5. geebt48cc

    geebt48cc Member

    So, does this mean (even if engine is running very well) , does this mean that the chipped chrome area will get worse in cylinder chamber.
     
  6. hurricane

    hurricane Member

    LOL Gee, i dont know, Ive never dug that far into my engine to even see the chrome. :)
     
  7. Bobbyoutback

    Bobbyoutback Member

    Glen , that scratch may be caused by a piston clip thats not seated in its grove , what I mean is have a look at the two little wire clips that hold in the gudgeon pin near the top of the piston .

    Don't start it till you check .

    Bob.
     
  8. hurricane

    hurricane Member

    Thx Bob, good answer. You both got me curious now to take a look at mine.
     
  9. Bobbyoutback

    Bobbyoutback Member

    Yep Hurricane its worth checking , I've had a engine seize because some goose in China made the gudgeon pin a bit to long & the pin on one side caught & jammed the piston to the cylinder wall wrecking both :icon_cry:

    Good Luck
    Bob.
     
  10. geebt48cc

    geebt48cc Member

    Ok, uno what's interesting is its never run this good with great consistencies. So, the more I think about it, the more I just want to believe it was like that right out of the box. The chip of chrome is right down on bottom of sleeve (about the size of a quarter)

    The way I look at it, is at least it's not up on top of sleeve wear the direct combustion is. I just hope it stays like that for a good while before another issue?

    Thax
    Glen
     
  11. GearNut

    GearNut Active Member

    If the chip is at the very bottom of the cylinder, not where the piston rings make contact, the cylinder may last as long as the rest of the engine. The top and bottom of the cylinder does not see as much wear as the middle of the cylinder due to the side loads applied by the angle of the connection rod. At the the top of the stroke and the bottom of the stroke the connection rod is near in line with the cylinder. Very little side loading between the piston and cylinder occurs. In the middle of the stroke the connecting rod is at an angle in relation to the cylinder and the piston to cylinder side loading is highest. This is where the most wear will occur because the piston is getting pushed into the cylinder wall.
     
  12. geebt48cc

    geebt48cc Member

    Really appreciate you explaining this stuff. Like I said before, These engines are not high dollar, but I do take care of my stuff I use despite of $$$. Everything you said sounds very true. I was thinking also to change over to a good synthetic oil.

    See, through the grape vine, I've also heard that it could of even of come from China that way to the states. There's one other place thats a scratch about 1 1/2" long on sleeve that's vertical. It's very smooth all around other than that chip (we've been talking about on the bottom) and a scatch. You can take your finger nail, running it around the sleeve, and feel it.

    I just got back in from only around ten miles.....The bike has never run any better. I just hope that it stays that way for a bit uno. It's a Skyhawk 48cc GT2, 357 miles,32:1

    Thanks,
    Glen
     
    Last edited: Nov 19, 2010
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