ring end gap

[jklw77]

There are a lot of formulas out there on ring end gaps start at
.003 x cu. in.
.004 x cu. in
.005 x cu. in.
the more exotic and hi performance you go the larger the ring end gaps become 
 for a typical 2 stroke saw , what are you guys in put on this , most saws are just a cast piston , 
 recently had a new cylinder not Homelite ,it was yellow in color  and the after market replacement piston kit rings would not fit bore!They butted and would not descend bore.using up side down piston  to true ring to bore .Yes the piston did fit bore . never had this happen before .Was really surprised .

[fossil]

Some of the manufacturers had ring end gap in their manuals. I can likely help if your yellow saw is a MAC or a Pioneer.

If the piston has ring locating pins, don't forget to add the diameter of the pin to the required ring end gap.

[jklw77]

thank you for input it was a 250 McCulloch,2 rings and aftermarket piston was like factory square cut ring , no pins for locating end gap

[jklw77]

found a service manual 63899 on McCllochs and in reading it states ring bore gap from .004 to a max of .012 ,these 1-40 - 1-53 ,200- 640 model saws , that would roughly 4.9 cu. in. (250) x .002 = .0098. .09 ring gap

[fossil]

I did as well. .009 to .010 sounds good.

[jklw77]

Thank you Tim