Alright, first time posting on here so about a month ago I bought a 2003 yz250f with "a bad head gasket", he showed me the oil he drained from it there was coolant in it so it made sense he said he was riding it and it started shooting coolant out of the overflow and smoking so I bought the bike for 400$. When ive went riding with him it has always ran really good, So I ordered a cometic top end gasket kit I tore down the engine and piston, rings, and the cylinder wall all looked good so I didn't replace any of that Also the head gasket looked good and I took the head to my uncles machine shop and had it milled down its withing .002" everything in the engine looked good to me although im not a mechanic! So I put everything back together and replaced the coolant cap oil filter and it wont start, its really hard to kick. timing is perfect I did a quick valve measurement .08mm I think it was. so I don't know why it wont start it has fuel spark and compression to my knowledge any help would be appreciated thanks!