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Thanks, is there any thing I need to change are do they go straight on ! Struggling to find a decent set of 500 carbs but I can get a set of really clean 450carbs
 

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If they are off 450K's, they don't have a vacuum port for carb balancing.
 

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There are a few threads on this, some folks have installed a port in the carb boot, others (like myself) have drilled and tapped the head at the intake and added a port.

Then there is always doing the way the 450 manual says, hold your thumbs over the exhaust outlet and adjust until they feel the same. I never had much luck with this process so I drilled the heads.
 
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