2000 yz250 top end onto a '16 bottom end?

chad_111
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chad_111
Edited Date/Time 9/18/2021 6:48am
A few of you had a ton of info on mating older year crank cases with my '16 engine parts and chassis. Now it's turning out that my cases just might be repairable but I am still left looking for a new (or used) cylinder. There's some older ones available, one in particular is off a 2000 yz250. Complete top end with cylinder, head, power valve assembly and piston. Would this mate up with all other components of a '16? The description say 99-01 but I'm expecting that it may be compatible with other years as well seeing that the cases are. Thanks in advance for any help!
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cwtoyota
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cwtoyota 9/17/2021 11:55pm
9/17/2021 11:55pm
The top ends and gaskets are 100% compatible with slightly different porting and combustion chamber volumes through the years.

1999 - 2002 was the first version of that cylinder and I believe the combustion chamber volume was reduce.
2003 - 2010 minor porting changes and the combustion chamber volume was reduced.
2011 - current

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