piston issue?

babss

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my bg56c piston won't rotate beyond bdc unless i spin the flywheel in the opposite direction where it stops at bdc again. i put a new carb on because gas in the muffler and difficulty pulling the rope without wrist injury. is it worth fixing?
 

bertsmobile1

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Probably not for a BG56 but it will only cast a bit of silicon to pull it apart
Most likely some thing has fallen down the induction tube
The bottom ends are generally a crowded race so don't give you grief
The other reason would be lumps of a broken piston.
Farmer Teck do replacement barrels & pistons for a reasonable price .
I have fitted a lot of them to various engines with good results when you get the right one ( can be a problem ) .
 

Rivets

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Pull the muffler and take a look inside. Tell us what you find.
 

Fish

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Also take off the starter and take a peek, a loose screw could be jammed somewhere.
bg56.JPG
 

Hammermechanicman

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Nothing to lose, try this. Remove spark plug and turn unit upside down and rotate flywheel back and forth a dozen or so times and see if the problem goes away. If there is liquid fuel in the crankcase you can get the problem you describe and it hydrolocks.
 

babss

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the bottom of the piston is contacting the counterweights on the crankshaft. with the piston removed, I can grab the connecting rod and everything rotates smoothly. wtf?
 

Rivets

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Star hit it on the head, bearing or bushing failure. Most likely cause, unless you replaced any internal parts.
 
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