Help!

[Shaner]

I bought a 1984 yt125.put new rings in it and now it won't start. Good compression,spark and fuel. I'm stumped.please help me

[225 Trimoto]

is the air fuel mixture good i mean is it to rich or to lean ? could be the timing is way off wack to i am not sure just a beginner at this also

[YTZ drew]

Did you ever have it running before you put the rings in it? And did you replace the piston, hone the cylinder, or measure anything? If the piston and cylinder are worn but the old rings were still sealing, your new rings may not be sealing well enough (yet) to build adequate compression. Try putting a gauge on it and do a compression test.