My father took this to another level
He started with a 76' kz900
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Not his bike but a Google pic of one
He got it in the mid 80's and rode it a while as is till he acquired part's. Then one day the mad scientist went to work
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Always upgrading and acquiring more parts.
The engine started as a 76' 900cc
Final build it was a 1438 with 1200 police interceptor top end making 205hp at the back wheel
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*Edit* Yes he did bring it into the living room every night....