Did you just install the 686 kit? Did this problem just begin? When it cuts out will it restart or does i t have to sit? Can you vary the throttle to keep it running? Did you make any other changes prior to this problem happenning?
I agree that it could be float level since it happens in the whoops. I have also seen the small brass cup that the main jet sits in get forgotten and that would cause a similar effect. Also make sure that your tank is venting properly.
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