What causes 16.5 Briggs and Stratton backfire alot while in use?

There are several reasons the engine would backfire, but the three main culprits are a dirty air filter, a loose intake manifold bolt or gasket (vacuum leak), or a faulty spark plug. If the problem is not one of these three, check out a book on small engine trouble-shooting and repairs from your local library. You will find other procedures a little more complicated in the manual to help you trouble-shoot.

More.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.