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And that is where I am up to for now. I had to trim the tabs off the face of the seal to get the inner seal in but otherwise the cases went together okay. Used the factor recommended three bond...

Time to move onto the bottom end. I've been trying to get hold of a bore gauge to check the cylinder clearance as I wanted to assemble the engine in one go. In the end I got impatient and started...

Accelerator pump lined added and the carbs "bench synced" after bolting them to the inlet manifold and loosening the screws that hold them together to "clock" them into place.
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So back onto the black jet ski engine now. I wanted to take the white jet ski engine apart first to see what was salvageable and work out the most economical way to fix them both. Conclusion was:
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Then they got professionally re-honed.
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Needed about 7 broken bolts removing from the white jet ski jugs so took them to my friend who worked his magic. He also tidied up the mating surfaces for me. Heads were shot blasted so they can be...

Ended up with a host of parts for restoration:

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Crank not too bad - some light rust on the bearings but it mostly rubs off. All the bearings felt okay when it came out and both ends of the crank look good so I've decided to clean it up and re run...

Cause of the low compressions on the white ski discovered. The mag piston had got a bit hot I think, not much else. Bore was still good.
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https://dub01pap003files.storage.live.com/y4m94eLU8CF19ggSm_fN4E57FeZJS4-6eBsv35Ds8qoWUhH0Y1rFdaT5gfvNsTVd9Qmfn4T14V9Tf6d7q7uITBduvmcbruIzE8S8-5_UMuL2j3pBQG_FXZ1mU6YOh-gwa3aFahDRoYG_Dbh_xG49lR9n2ZGDA0...

Engine work began. This one really put up a fight. Many snapped bolts and pain was to come. Quickly concluded that the engine had never been apart.
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Cleaned up pretty good.
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https://dub01pap003files.storage.live.com/y4mWSIgyxzDbI-JGLV9881rKVzozz3QjKZpfvHDbdM5lGw-mY5weW67LyvjOKiri9INk8fGXpgpDj5IqZMAR36gSmaa9YDShRXlC_ObgiMg0UVZL-kvTW2HvvKiA17HT9UQsmJFfCbq2r4cwRy-ECJ9aYoJb_z...

So the photos above are all from the black ski.

Crank was toast - even though it had been rebuilt in the past, the wrong bearings had been used. Someone had gone to the effort of rebuilding it...

https://dub01pap003files.storage.live.com/y4mRUyCPF9xmy44rdTMmL3XOpoEEwumMkyrD-HJGiWWbMxSxaFiSiT2-A4LqnRAqmmLLc0hB1XL5NJOpxkZ0Dl7-4Lr_wQTWOC8HjdZw9qbkthsDC165wkAfuARl_1mia09TVQLxFP6lAqptYgAPQVDdpSBuLn...

https://dub01pap003files.storage.live.com/y4maT4hqkeuilP_pL31PxBVXdvfUMeJuYBnNodQV4euYWNpD0HdKCRNY7vOqMO2nHpJK3KwYRwwJohEnRbCu8vdiMWjN3MSmOJ0cjsh0UVekamLbq-zw3vITwF7kSIJYa0C9glgki70m0HOnGCuYYXfSgDnm8m...

https://dub01pap003files.storage.live.com/y4mkMsyO8k5h1WmyARAuYUYMVQ11GO3oCvVrMOHLG40MMePqYg9-2PvGq3bQ41ulaMQbDHgOewv79012n_h6LxUJj_Vn8-stL_IZVAKdFvHOxy8ehU64_UaoVzeRRFgv4eQb8cW1st5eDLjPkuDayDxkEEuWSv...

Salt water ski so lots of corrosion on everything.
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Started stripping out the engine bay to remove the engine for a rebuild. Could not get the crank to turn, even with the driveshaft removed. Expecting internal carnage.
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Slight misshap with the trailer - axle rusted through. New axle on order - lead time 6 months!
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Usual jet pump corrosion was binding on the impeller - however not the cause of the engine being locked up.
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https://dub01pap003files.storage.live.com/y4mtmeGL-MPa9haZFAAVYgSla98iPU_fmdI4IDtPdm5V2IPMgmEggbBN1ges-DuHCDfJcwJ_PPUMeBNTgV2gTU8S96pL0OWs-IfpCsrdqOURt9FwLTLPjOs_McqUL55F9KIZ93HxI2rz6Ny4WwreB1l9kgQFsy...

Okay updates below. Ended up buying another ski, in mint condition but the engine was locked up. I figured worst case I could make one good ski out the two. I'll let the pictures talk.

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More pics

Pics below