Apple to Oranges.....
The Honda CR 125 heads to cylinder use a head gasket (not like a gasgas that uses a o-ring seal). The gasgas cylinder to head, seals with 0-rings, not a head gasket.
O-ring head sealing surfaces are very forgiving to small amounts of warpage. It is very possable for a Honda CR 125 to leak do to; both a bad cylinder head surface to be distorted (mostly do to over torquing the head nuts, or over heating from coolent problems).
I have found that people over torque head nuts on these types of engines (thinking a top end job is a cake-walk and way tighting is good). and not only that, but the top of these small cylinders can be distorted too (it could be the top of the cylinder and cast liner surfaces are distorted).
Just remember; 16 to 18 foot pounds of torque is all it takes to seal any 8 mm head stud.
Ron
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