Fitment 99-24 YZ250 and 16-24 YZ250X
THIS IS A SERVICE YOU NEED TO SHIP YOUR ENGINE TO US FOR REBUILD
There is an engine packing guide on the website to make shipping easy. 
Price starts at $3200 Damage, modifications, upgrades and return shipping are extra.
When this is paid for before arrival turnaround time is sped up.
Typical turn around is 3-4 weeks once engine arrives.
265 is a 68.50mm bore and 265cc the 300 is 72mm bore and 293cc commonly referred to as a 295 or 300.
No proprietary parts are used you will get a list of the different parts required for these big bores. When it’s time to rebuild it will be easy to source the parts anywhere online.
This package includes everything in the Premium stock rebuild and the custom performance rebuild packages. List from those packages added below.
Additional things included in this package:
Crank balancing.
Power valve modifications.
Head mod to suit new bore size.
300 gets the cylinder top welded and machined for a MLS head gasket.
LIST BELOW HERE IS ADDED FROM PREVIOUSLY MENTIONED PACKAGES
Porting to suit desired power delivery.
Head mods to suit desired fuel and power.
Transmission polishing.
Rebuild labor.
Carb clean / rebuild / jet.
Vapor blasting.
Crank rebuild labor.
Cylinder replating.
All bearings (qty 14)
Clutch plates and springs.
Reed petals.
Updated shift stopper.
All gaskets and seals.
Water pump shaft.
Clutch hub fold tab.
Counter shaft collar and fold tab.
Countershaft sprocket 13T or 14T (stk) or 15T
Piston kit.
Connecting rod kit.
Hardware Kit.
Spark plug.
Shift pawl springs.
Cerakote clutch and ignition cover.