Hi all I just bought a jawa 207, I've got the "slight" problem of it not running. Firstly I'll list all the things I've done. I've tested the thyristor it seems fine. I have a new 4v silver can coil. I've got beautiful spark but only with one type of plug and it's not the type that jawa recommends the others just dont spark? The head had a stripped plug thread but still has 150psi compression on 2 different testers. I've even done a gas drain on the head upside down to see if it leaks past the plug. The carb is cleaned and sealed. Lastly I've thrown either starter fluid down it and it wont fire at all not even a sputter. I've cleaned the stator drum and gapped the magnets. I set the timming for 1.5mm after the mark at TDC. All seems to be in order but it wont start. If someone anyone can help it would be much appreciated.