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85 xr250 help

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i have recently aquired a 85 xr250r for 50bucks it has a fresh big bore kit the problem i am having is finding a head gasket the piston mics at 77.75mm can i use a stock head gasket or can anyone tell me what size kit this is any help is appreciated

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You can get a 78mm bore head gasket kit from Cometic for $35-40. I wouldn't use the stock gasket unless the piston is an Arias. They have a slightly lower compression height than the Wiseco. It's 270cc with a 78mm piston.

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the thing is i dont know what brand the piston is it has the numbers 311198 on the top this is my first old honda to rebuild so i reallly dont know where to look for the parts. are these bikes really worth bringing back to life just wondering kinda having mixed emotions abbout it now

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does anyone know if helicoils will work for the head bolts

Yes. I would recommend doing all the head bolts if you already need one installed. They come as a kit.

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