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Seized engine

loxley007

CB750 Addict
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Hi all, it’s my first bike project (1979 CB 750) so I’m really learning everything!

My question is that I have a seized engine and it’s expensive to get hold of Marvel Mystery Oil to try and free it - what off the shelf alternatives are available in the UK?

Thanks for the help.
 
And can I check, is it best to pour this in through the spark plugs gap or take the head off and apply it directly?
 
Put it in the spark plug holes - then let it stew for 3 to 4 weeks. Then slowly turn crank forward and backward just a couple mm if it moves and add some more juice. Slowly very slowly!!
 
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