Vali

So. I will take my time to explain as best as i can. Sorry for my english So i bought a husky wr250 2007 ( i think) with no spark. After trying some cdi s i had around i got one working (by working i mean spark) tried to startnthe bike but all it does it pops thru the exhaust, after many days of fiddling around i removed the stator and flywheel case and look like it has an mini 4 hierro motoplat flywheel and stator. Tried retarding the spark but same results, then i had the ideea to take the cilinder head out put the spark plug next to the cilinder and i took a slow mo vid to see if the spark meets the piston at TDC and it does but then sparks one more time at btdc??? Why it does that? I dont know what to do anymore. And i dont have money to throw at it at all. Any help will be much apricated. Thanks