Its a difficult pill to swallow but yes did a leak down test yesterday on my mc 18 and centre seal is, lets say leaking like a tub without a plug in it. For me it is beyond my comprehension that Honda will allow this
. I have rz 500 rz 350 tzr 250 3ma 1kt and 3xv get the cranks done in the snap of a finger parts available if not from Yamaha, yambits has it. My crank is now a paper weight well if I press it apart 3 paper weights 
. But I vow this I will find a way to make it work maybe suzukii has a seal for me . I will press it apart and find a seal to make it work may not be this year but I will get their.
Fact is in the next 30 years no more Honda mc 18 twostroke';s around. I will have to display it as a model of how the bike once looked
Sad thing is this bike actually is the one bike that disciplines all the other twostrokes out their it goes like a rocket ship 3ma doesn't come close. My 3ma track bike is still going at least so I can not complain to much oh yes rebuild the crank last year .
Sorry for the complaining I just think we need to do something about this lets get the Hondas running into the future I still want to race my mc 18 in 30 years time.
Edd