[zingshoen]

not sure what the problem is, but take heart! i have this kinda motor and had to go over the whole thing a few times, until she would fire up. from what i remember, there was no real mark on the flywheel for TDC for starters, so i ground a mark on the flywheel and set the valves. after chasing my tail for a bit, she started up, but ran awful, until i cleaned the carbie which was new, set it up for stock, left the air filter off, which for some reason had blocked the venturis. after that it was smooth sailing and it is a fantastic motor - so from my experience, if you get fuel and a fat spark, i still had to set up the carbie properly.
the crf230 manual was helpful, i can dig up the specs, if u don t have them, but check thumpertalk, they had a pdf AFAIK.