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    • Something to bear in mind: if the adjustment screw is on the engine side of the carb (like this one) it is a fuel screw, so turning it out richens the mixture. Most 4 stroke carbs are this way. If it's on the airbox side, it is an air screw - common on 2 strokes. This works opposite but really does the same thing. It just fine tunes the pilot (slow jet) circuit in all cases.
    • 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

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