stock compression of YZ400F

[250X_project]

Anyone know the factory compression ratio of the YZ400F 4-stroke dike?

Is it possible to get a 9.4:1 from Wiseco or any other places?

Also does ayone know any 86mm (or bigger) pistons with a 17mm pin (maybe 18mm) THANKS

my yz426 is 12:5.1 compression stock so im gessing the 400 is some wear around their.

[250X_project]

You run race gas from factory? No kidding. Thank you!