Crankcase Modification
This will void your factory or aftermarket warranty. Further more this mod is only useful for those who intend to compete in pro level competition with extremely high compression. Basically if your a Rec rider then your wasting your time with this mod.
Understand that you will need to do a complete rebiuld of the motor in order to complete this safely.
This has been a small modification that has been around for a long time. Its not hard and is recommended to do to any Kawi 1500 motors with large amounts of modification/boost.
I started with a new set of cases. Then split them.

This simple mod will give crank case pressure another route to escape from the bottom half of the motor by routing an escape into the timing chain cavity. Its said that this mod helps prevent the blow out of engine oil of highly boosted Kawasaki four stoke engines.
Ill start with a new set of cases for this demistration.


Careful of the mating surface. Dont nick it or alter it in any way.


Carefull as the cases have vary shard edges.


First blow off any and all possible metal shavings before going to the solvent tank for its bath, then wash it again with soapy water and plenty of clean water. Blow it off again and inspect for debry or anything that needs another washing for. Please be sure that all oil or cutting lube is removed especially from the mating surface.
Hold on more coming for you.
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any other way to go about this mod without splitting the cases? Does not look like any other way around it!
Not that I know of or would want to risk. If your far enough down to the mod then you might as well take the extra hour or so and do it safely.
Any report of case failures with the mod?
None never, in fact it actually re leaves case pressure. Its been a secret mod since 2004 on the 15F motors.
Looks like the two holes drillled would weaken that area. If it has been proven that is good news.
no case failures here! no other issues either
only 2 holes in the center and a larger one on the rear ?