50SX max engine
 

HELLO I AM TRYING TO PUT A NEW RING IN THIS ENGINE CANNOT GET PISTON OFF CRANK SHAFT.DO YOU HAVE TO PUT RING ON WITH PISTON IN THE ENGINE. I GOT THE SLEEVE OUT.

RE: 50SX max engine
 

Typing in all caps is considered shouting.

Once the sleeve is out the rod should slide back and forth a few mm. Sometimes its stuck but with the crankshaft at TDC it should slide enough to pop off the crank pin. You might have to shoot some WD40 up from the bottom.

RE: 50SX max engine
 

I do not know abouit the 50SX but on some OS engines this is not so. Even with the sleeve out the rod/piston assembly will not slide back far enough on the crank pin for removal. If there is a hole in the back of the case this engine is of that type.

Is there a hole in the back of the case?

Ed S

RE: 50SX max engine
 

Hello Yes the whole cover comes off. I can see the rod an big bearing.

RE: 50SX max engine
 

The con-rod will come off of the crank shaft...It had a bear of a time getting mine off, but it finally did pop off. Make sure that the con-rod is sliding on the wrist pin toward the back of the piston. Mine wasn't doing this at first and needed some extra lubrication. If the con-rod doesn't slide to the back of the piston, it will never come off of the crank shaft. Also, for some reason, it assembles a lot easier than it disassembles!!

Good Luck

RE: 50SX max engine
 

That was not the hole I meant actualy, but JCB describes the procedure once the backplate is removed.

Ed S

RE: 50SX max engine
 

Thanks I know what you are talking about now. I will check the piston.

RE: 50SX max engine
 

I am puting a new ring in this engine should I hone the cylinder to rough it up like they do on cars.