Briggs and Stratton 208CC engine

Hello,
Just took a look at a 208cc briggs the other day on a snowblower. Neighbour has one and asked my opinion on it.

This machine can backfire like no tomorrow. It will back fire on start or will backfire if you give it too much throttle too quickly.

The carb on it looks like there are no adjustments. Im thinking it is running too lean. If I cannot adjust the carb, is there anythnig else I can do to prevent this gun shot from occurring.

I mean like this is a heavy duty crisp backfire. Scares the entire neighbourhood.

Looking around some forums it looks like there are many other out there experiencing the same thing.

I thought i would come to the professionals at DIY to see if anyone has exepreinced the same thing and could provide some advice.

Thank you,

 

Does the backfire come through the carb or the exhaust? I guess if it's that loud, it's through the exhaust. Does partial choke keep it from happening? Does it run fine other than that? What model engine is it?

 

Hi Cheese.

The backfire is definetely through the exhaust. I will try it tomorrow on partial choke. Once it is running, trhere are no problems. Runs great. It is only on start up. Full choke, full throttle. If I ease the throttle back a little, it may still happen.

I did not try easing back on the choke but figured I needed full choke to get it going.

Ill try 3/4 choke on start up to see if there are any improvements.

 

If it's only when you try to start it, try a new plug.