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85 YZ250 Cylinder interchange

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i know 86 to 98 are the same bore, i have an 86 yz250. theres nikisil cylinders but i believe they are later like 93 and up.

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Should be like '84 thru '87 that would work becareful and check that was when yammie couldn't decide on if they wanted to use head gaskets or oring setup.

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So, an 88 won't fit an 85? Does the head have a place for the o-ring or is it the jug? Or both?

Actually, will an 88 jug and 88 head fit on an 85 case and rotating assembly to eliminate the o-ring problem?

 

I can find a decent 88 head and jug with life left in it but so far an 85 setup has been elusive.

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88 Jug is a different shape it wasn't mentioned in tech specs but that was the first year yammie also went to hard platted cylinder walls.

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The jug and head have grooves for o rings on 86-87. 86 to 98 was all the same bore and stroke... which is where alot of people get confused.

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