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    • What I would do is take a stainless steel corner square and place it down on a flat surface. Then put the ring in the corner of the square and check for the slope against the edges of the square and then flip the ring over and check again.    
    • Yes I looked at the rings very closely, no marks.  The mark on the original is very easy to see.  No writing, no dots, stamps, paint etc.  Just plain black.  I'll check for taper with a straight edge, thanks for the tip!    
    • If the dark spots are just grease from your fingers then yes the cylinder is fine.   The ring should be tapered and not noticeable to the eye without really looking at it or putting  it up agains a flat surface like a smooth piece of steel or on a metal ruler but its tough to see.  Did you look on the flat spot of the rings, the rings are usually marked there?  
    • The dark spots are just grease/dirt from my fingers, I got the new piston and rings but I'm perplexed.  There are no markings on the rings.  The originals only have a mark on the second ring down, and it's supposed to have a taper according to the manual.  The new rings have no marks whatsoever.  I'm sure the oil rings don't matter but the compression ring should.  I can't see the taper with my naked eye.  The old one doesn't appear to have a taper either but it may just be worn down enough to not see it anymore.  Anyway, if the ring has no marks does that mean it can go in either way?  The instructions are generic but they do state that that the marks go up (assuming there is a mark).   Thanks
    • Very good!  That air fuel screw is tapered and fits into an air passage in the carb, so turning the screw out increases the airflow. Some carburetors are different but most work this way.  Over time the screws tapered edge wears away and the adjustment gets less sensitive.   The optimal position where the engine is at max performance is usually done with the engine running. As you turn the screw in one direction or the other the engine revs higher or lower.  Higher is what your looking for the higher it revs the better the air fuel ratio is getting and you keep going in that direction until the engine starts to rev lower.  Thats the spot where  you stop and come back a hair. 

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