86 yfm225 won't start

[Azrack]

Hello new to the forums. Just picked up a 86 moto4 yfm225. When I got it the engine was partially seized I did the bp blaster for a few days and it turns over great now. I get plenty of spark and wet plug but it won't start. I checked the valve clearances and timing both correct and I cleaned the carb. Occasionally it will catch and backfire through the carb but that's the best I can get. I would greatly appreciate any ideas anyone has.

Thanks

Az

[Azrack]

So figured it out. The intake valve was stuck when I checked the valve lash it looked right but I think the previous owner set it to the stuck position. I got the valve free with more pb blaster and found out the hard way the intake rocker arm broke from the over zealous setting. New head otw (cheaper then a single arm ) guess use the time to check the cylinder wall and piston.