Speedfight 100cc starting problem

[bvast]

Hi gyes, first sorry for my bad english. I have speedfight 1 97y. 100cc since 2006. It start perfectly until two years ago (I ride it rearly)
The symptons are: If I start it somehow (very hard) it works fine. I turn of, and try to start it agayn it start several times without problems, but one of these times, it try to start but unsuccessfully. And from here begins the movie... I start it with starter (my kick start is broken) i try to start and the spark plug get wet or it tryes to start and have a detonations in the exhaust.
I have a spark, all the time. Compression is good. New spark, and new vacuum valve for the fuel. Carb is clean. How much psi must be the compression?
Sorry for my bad english, I hope you will understand, and help me with some advice

[unitynotsocri...]

If it is used rarely then I would check for electrical corrosion on the waiting loom , the starter motor may also be corroded . I'd get a kick starter , you will have a more reliable scoot if the battery isn't stressed , especially now its nearly winter.
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[bvast]

All of these is checked. It`s poor compression, 2-3 bars. The piston and cilynder are in good shape, but the piston rings and the piston pin are in bad shape. I will change them, and I expect positive result.
Thanks for advice. Sorry for the bad English