Broke In Cam Now Popping Sound

[toofun]

I really appreciate you comments but here is why I have not done it that way. First of all , originally I did it EXACTLY that way. I tightened the nut until there was no UP AND DOWN play, then I gave it 1/2 turn. The engine started and then after a while when I tried to raise the rpms to adjust the timing it popped and backfired like crazy. I shut the motor off and tried to restart and it wouldnt start unless I let it cool down for about 30 minutes So everyone told me I had them too tight.

When I read the book they say to adjust the valves the same way that you did except they said to do it AFTER THOROUGHLY WARMING UP THE ENGINE. So you can see why I am a little confused. I am assuming that when the engine is warmed up or getting hotter the valves and engine will expand making the clearances tighter. So if you are suppose to take the slack out and then turn it 1/2 a turn while it is EXPANDED AND HOT then that would mean that the valves will be a little looser when the engine cools. BUT if you take the slack out and give it 1/2 a turn when the engine is COLD, when the engine warms up and expands it will be too tight wouldnt it? This is why I keep thinking that the valves need to be looser before I start it up. Dont mean to be difficult really appreciate the comments but need a definitive answer to help me make sense of it all.

Thanks
Mark