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vendrillo

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About vendrillo

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    Connecticut
  1. vendrillo

    Top End, Low Compression 92 kx125

    KDXGarage, I am using an Empire 6in. digital meter. I put a 54.5mm ring on the piston and the compression has come back. I kicked it over for a while and it did start for a second, but cut out as soon as I gave it some gas. The top of my piston was wet with milky brown oil. I also had a coolant leak into the transmission so I took apart the crankcase cover and am replacing my water pump seal and crank seals. Hopefully that does the trick and she'll be running. If that doesn't work my next guess about the oil in the cylinder would be the cylinder's oil seal rings.
  2. vendrillo

    Top End, Low Compression 92 kx125

    I don't have any pictures right now, but can post tomorrow. I just measured the cylinder bore and piston with my micrometer. Bore is about 54.8-54.9mm and the piston is about 54.5-54.6mm. From reading other posts the OEM specs for a 92 kx125 are 53.9mm-ish for the piston and just over 54mm-ish for the cylinder bore. I'm thinking I ordered too small a piston ring and the person before me may have bought a different sized piston when the cylinder started to wear. But there is no lip or scoring on the piston which tells me it is in decent shape. I'm not sure, at the moment I'm starting with the potential cheaper fixes and going from there. And according to another forum on here, the piston spec is 53.945mm to 53.960mm and the cylinder bore is 54mm to 54.015mm. Still, maybe my .2-.3mm difference is too big. I'll submit pictures when I can.
  3. vendrillo

    Top End, Low Compression 92 kx125

    I don't have any pictures right now, but can post tomorrow. I just measured the cylinder bore and piston with my micrometer. Bore is about 54.8-54.9mm and the piston is about 54.5-54.6mm. From reading other posts the OEM specs for a 92 kx125 are 53.9mm-ish for the piston and just over 54mm-ish for the cylinder bore. I'm thinking I ordered too small a piston ring and the person before me may have bought a different sized piston when the cylinder started to wear. But there is no lip or scoring on the piston which tells me it is in decent shape. I'm not sure, at the moment I'm starting with the potential cheaper fixes and going from there.
  4. vendrillo

    Top End, Low Compression 92 kx125

    William1, the piston felt and fit snug when put the cylinder back on, could it still be the barrel? The piston felt and fit snug when put the cylinder back on, could it still be the barrel?
  5. Hey, I've been fixing a 1992 kx125. When I bought the bike it had little to no compression. My compression tester barely read anything; I could turn the kickstart over with two fingers. I took apart the top end: the cylinder and piston were in good shape, no scoring on either, but the ring was shot. I replaced the ring and gaskets and put it back together, I made sure the ring was the correctly installed: correct side facing up, gap around the nipple. The compression is better, but I can still turn the kickstart over by hand, but I do have a little more resistance. Still, the compression is only 50psi. I didn't see any leaks from the cylinder or head. Any ideas why I still have low compression?
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