Small Engines (Lawn Mowers, etc.): Gilson Snowblower Engine Question, blown head gasket, briggs stratton

Question
 My Gilson snowblower with a Briggs & Stratton 4HP engine suddenly doesn't run as smooth as before.  What happens is it kind of misses and loses power with the choke all the way off.  It seems to run better with the choke half on.  And it doesn't matter whether I adjust the jet to run lean or rich, it always runs better with the choke half on.

 At first I thought it might be water in the carb, but I ran some alcohol through it and the symptons still persist.

 What ever could be the problem?

 Thank you!


Answer
 Hello Steve:

 Check Compression. Check for a Burnt Valve or Blown Head Gasket. If these are Good, then Remove, Disassemble and Soak the Carburetor Overnight in Carburetor Cleaner. Then Blow Out the Passages with Compressed Air. Install New Kit. If the Main Jet is Restricted the Engine will Miss Until the Choke is Applied Slightly and the Require Gas is Pulled through the Choke Port to Offset the Restricted Main Jet. Hope this Helps. I am here if you Require more Assistance. Thanks.

 Good Luck

 Respectfully

 John