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Yamaha dt125 won't start

After rings replacement yamaha won't start. I started it by pushing and, low compresion and low power

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Many piston compression (rather than oil) rings are uni-directional, and need to be installed with the proper side upward. The rings will have a "T" or "TOP" etched on the surface that needs to face upwards.
So my first question is, did you install the rings upside down?

Second, why did you replace the rings?
Did you measure the cylinder bore? Was it oversized, or out of round?
Is the bore worn enough that the piston is now too loose a fit?
Did you get the correct size rings? If you bored the cylinder, did you get the proper oversize rings?

Posted on Nov 20, 2013

Testimonial: "i installed the rings correctly. about month ago i drove my yamaha and suddenly it lose a power, it was driving very weak and start shoot from exhaust. I take off the cylinder and head and saw that one rings was broken, so i bought new one( 56mm-original sized piston) and replaced them. after i put it together i try to start it and it wont start. So i bump start him and i must give a lot of throttle to keep him work, and i can drive him but it's very low on power and doesn't sound right"

  • debil totalni
    debil totalni Nov 20, 2013

    i installed the rings correctly.



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