Motorcycle Repair: Kx 80, gas vapors, plug hole


Question
ive had it for7 years and it used to be raced so im sure the rings were replaced b4 i owned it but i blew it up a few years ago, rebuilt it but i dont remember if we replaced the rings or not

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my dad checked compression and it was at 50 pounds, is that about right?
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Question -
i have a 88 kx 80 and was riding it and racing a freind, not getting on it to hard but was riding the power band. was in 6th gear rpms not to high and it cut out and i cant get it to start now. has compression, spark, and is getting gas (cleaned carb) any ideas?

Answer -
Is it trying to fire?  If so, tell me EXACTLY what happens.  I need ya 2 b as specific as possible!  Good luck and let me know!

well when i checked the spark the gas vapors that came out the spark plug hole ignited but it dont seem to be trying to start at all
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So there was raw gas in the cylinder?  That would mean it's not firing hot enough.  I would say u should try to change the plug and let me know what happens!  Good luck.
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So there was raw gas in the cylinder?  That would mean it's not firing hot enough.  I would say u should try to change the plug and let me know what happens!  Good luck!

How longs have u had the bike, and have u ever put in new rings?

Answer
Ok. If the bike is ridden only seasonally it is recommended u replace the rings each year as a 2 stroke burns them up rather quickly.  How did u clean the carb by the way?  Y did the vapors from the plug hole ignite, Were u testing the plug that close to the hole?  If so, it still doesn't mean it has "good" spark.  Change the rings, tell me bout the carb and install a new plug.  Do the plug first to see if it will fire.  Good luck and let me know!