Bore diameter on those pit bike hydraulic clutch master cylinders?

BigSkyCountry

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So, the ferrule on my clutch cable popped off on the Williamsburg Bridge today and I had to Flintstone it to the other side this morning. Additionally, here in NYC the riding is extremely clutch-heavy. I'd like to run my existing Sportster controls with a cable to a separate master cylinder to the slave. Can anyone tell me the bore diameter on the ebay-style master cylinder from the pit brake set-up?
I'm thinking I can mount a new master with a short hose to the pit bike slave cylinder and actuate the master with a cable (common rear brake pull-type master).

So yeah, anyone know the diameter on them bores?
 
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