850cc crankshaft bolt

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I originally posted this in the wrong forum and therefore reposted it.
I would like to know in which direction you turn the bolt that locks the pulley onto the crankshaft ie; ii it a right or left hand thread and also how do you lock up the crank to stop it turning while undoing the bolt.
Any info on this would be appreciated.
The engine is an 850cc 3 cylinder mira
Thanks mortda