Hey Bryce, thats correct, 90% of all 2 stroke water cooled engines have coolant running through the heads, not any 4 stroker though. This is what im sayin that its the valve train and cam that make for the excessive material to have to recess the spark plug, not the cooling passages.
later bud.........IF IT AINT LOUD ITS NOT RUNNING RIGHT. ha ha ha

 

Always clean'r up before ya go to work on her!