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Will clean out ports at least before checking for compression and spin. Oil in window looks like oil, so I’m hoping intake valves have been closed this whole time.
Not really looking to spend big money on this, I’d rather work on something more...special, so might be a case of ‘really’ getting to know the bike.
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Might be one of those ones where if you had a big warm garage that you could slowly take the time to strip it all, clean out the internals and fully refresh/rebuild, it would be worth it but otherwise it isn’t.
I’ve dreams of buying a 2 seater sports car and stripping it to the chassis and rebuilding but it ain’t happening in London and certainly not in the next 2 or 3 years.
oops - does the crank turn/free pistons ?
you could do this,
https://www.ebay.co.uk/itm/Honda-CBR-600-FM-FN-1991-1992-Engine/363191782670?hash=item548feacd0e:g:8qUAAOSwVO1fu4E4
or ' really ' get to know the bike ( which I'd do if there was no rush ).