If that o-ring cracks or changes shape in any way the oil from the back-right cylinder stud will completely strip the head gasket of any material. If the cylinder stud bolts aren't equally torqued at the pounds listed in the CG 250 repair manual you'll also get this..
Get gasket kits off Google shopping or AliExpress. RPS and all the dealers who are basically drop-shippers for them want a fifth what they sale a new engine for a single head gasket..
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