If it is fuel related, why are all four plus indicating rich?
When I rebuilt the carbs, I did not replace the orings for the pilot jet plugs. Ive read that these plugs force the piolt jet to siphon fuel through the main jet instead of the float bowl. Maybe they are leaky, and the idle jets are sucking in too much fuel??
Great forum and Resource for 1st and 2nd gen Honda V4s SabMagIntercept